diff --git a/integrations/mimecast/manifest.yaml b/integrations/mimecast/manifest.yaml
new file mode 100644
index 0000000..4917f60
--- /dev/null
+++ b/integrations/mimecast/manifest.yaml
@@ -0,0 +1,143 @@
+id: mimecast
+name: Mimecast
+version: 1.0.0
+description: "Mimecast (Email Security API) — anti-phishing containment: list/release/reject held messages, search messages and get message info, block URLs (managed URLs), block senders, create remediation incidents, and decode rewritten URLs. HMAC-SHA1 signed authentication; stdlib-only, no extra Python dependencies."
+changelog: "1.0.0 — Initial release: held-message list/release/reject, message search + info, managed URL create/list, block sender, create remediation, URL decode."
+category: email
+
+# Per-instance configuration. Requests are signed (HMAC-SHA1) with the
+# application + access/secret keys.
+config_schema:
+  properties:
+    base_url:
+      type: string
+      description: "Mimecast API base URL (e.g. https://eu-api.mimecast.com)"
+    app_id:
+      type: string
+      description: "Application ID"
+    app_key:
+      type: string
+      description: "Application Key"
+      x-soar-sensitive: true
+    access_key:
+      type: string
+      description: "Access Key"
+      x-soar-sensitive: true
+    secret_key:
+      type: string
+      description: "Secret Key (base64)"
+      x-soar-sensitive: true
+  required:
+    - base_url
+    - app_id
+    - app_key
+    - access_key
+    - secret_key
+
+commands:
+  - id: list_held_messages
+    name: mimecast-list-held-messages
+    description: "List messages currently held for review."
+    risk: read
+    inputs_schema:
+      properties:
+        admin: { type: boolean, description: "List all held messages (admin view) vs. the account's own (default true)" }
+        limit: { type: number, description: "Max messages (default 100)" }
+      required: []
+    outputs_schema: { properties: {} }
+  - id: release_held_message
+    name: mimecast-release-held-message
+    description: "Release a held message for delivery."
+    inputs_schema:
+      properties:
+        message_id: { type: string, description: "Held message ID" }
+      required: [message_id]
+    outputs_schema: { properties: {} }
+  - id: reject_held_message
+    name: mimecast-reject-held-message
+    description: "Reject a held message."
+    inputs_schema:
+      properties:
+        message_id: { type: string, description: "Held message ID" }
+        reason: { type: string, description: "Optional rejection reason" }
+      required: [message_id]
+    outputs_schema: { properties: {} }
+  - id: search_messages
+    name: mimecast-search-messages
+    description: "Search tracked messages by sender, recipient, or subject."
+    risk: read
+    inputs_schema:
+      properties:
+        from: { type: string, description: "Sender address filter" }
+        to: { type: string, description: "Recipient address filter" }
+        subject: { type: string, description: "Subject filter" }
+        start: { type: string, description: "ISO-8601 start time" }
+        end: { type: string, description: "ISO-8601 end time" }
+      required: []
+    outputs_schema: { properties: {} }
+  - id: get_message_info
+    name: mimecast-get-message-info
+    description: "Get delivery and processing details for a tracked message."
+    risk: read
+    inputs_schema:
+      properties:
+        message_id: { type: string, description: "Message ID" }
+      required: [message_id]
+    outputs_schema: { properties: {} }
+  - id: create_managed_url
+    name: mimecast-create-managed-url
+    description: "Add a URL to the managed URL list (block or permit)."
+    inputs_schema:
+      properties:
+        url: { type: string, description: "URL to manage" }
+        action: { type: string, description: "block or permit (default block)" }
+        match_type: { type: string, description: "explicit or domain (default explicit)" }
+        comment: { type: string, description: "Optional comment" }
+      required: [url]
+    outputs_schema: { properties: {} }
+  - id: list_managed_urls
+    name: mimecast-list-managed-urls
+    description: "List managed URLs (block/permit list)."
+    risk: read
+    inputs_schema:
+      properties: {}
+      required: []
+    outputs_schema: { properties: {} }
+  - id: block_sender
+    name: mimecast-block-sender
+    description: "Block (or permit) a sender for a recipient."
+    inputs_schema:
+      properties:
+        sender: { type: string, description: "Sender address to block/permit" }
+        recipient: { type: string, description: "Recipient address the rule applies to" }
+        action: { type: string, description: "block or permit (default block)" }
+      required: [sender, recipient]
+    outputs_schema: { properties: {} }
+  - id: create_remediation
+    name: mimecast-create-remediation
+    description: "Create a remediation incident to pull malicious messages from mailboxes."
+    inputs_schema:
+      properties:
+        message_hash: { type: string, description: "File hash to remediate (provide this or message_id)" }
+        message_id: { type: string, description: "Message ID / internet message ID to remediate" }
+        reason: { type: string, description: "Reason for remediation" }
+      required: []
+    outputs_schema: { properties: {} }
+  - id: decode_url
+    name: mimecast-decode-url
+    description: "Decode a Mimecast-rewritten URL back to its original form."
+    risk: read
+    inputs_schema:
+      properties:
+        url: { type: string, description: "Rewritten URL to decode" }
+      required: [url]
+    outputs_schema: { properties: {} }
+
+  - id: test_connection
+    name: mimecast-test-connection
+    description: "Verify connectivity and the signed credentials (used by the Test button)."
+    risk: read
+    inputs_schema:
+      properties: {}
+      required: []
+    outputs_schema: { properties: {} }
diff --git a/integrations/mimecast/scripts/block_sender.py b/integrations/mimecast/scripts/block_sender.py
new file mode 100644
index 0000000..900ae1a
--- /dev/null
+++ b/integrations/mimecast/scripts/block_sender.py
@@ -0,0 +1,75 @@
+import json, os, sys, hmac, hashlib, base64, uuid, datetime
+import urllib.request, urllib.error
+
+
+def _cfg():
+    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+
+
+def _inputs():
+    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
+
+
+def call(uri, cfg, data_payload=None):
+    base_url = str(cfg.get("base_url", "")).rstrip("/")
+    app_id = str(cfg.get("app_id", ""))
+    app_key = str(cfg.get("app_key", ""))
+    access_key = str(cfg.get("access_key", ""))
+    secret_key = str(cfg.get("secret_key", ""))
+
+    request_id = str(uuid.uuid4())
+    hdr_date = datetime.datetime.utcnow().strftime("%a, %d %b %Y %H:%M:%S UTC")
+    to_sign = hdr_date + ":" + request_id + ":" + uri + ":" + app_key
+    sig = base64.b64encode(
+        hmac.new(base64.b64decode(secret_key), to_sign.encode("utf-8"), hashlib.sha1).digest()
+    ).decode("utf-8")
+
+    headers = {
+        "Authorization": "MC " + access_key + ":" + sig,
+        "x-mc-app-id": app_id,
+        "x-mc-date": hdr_date,
+        "x-mc-req-id": request_id,
+        "Content-Type": "application/json",
+        "Accept": "application/json",
+    }
+    body = {"data": [data_payload] if data_payload is not None else []}
+    req = urllib.request.Request(base_url + uri, data=json.dumps(body).encode("utf-8"), headers=headers, method="POST")
+    with urllib.request.urlopen(req, timeout=60) as r:
+        raw = r.read()
+        resp = json.loads(raw) if raw else {}
+    fails = resp.get("fail") if isinstance(resp, dict) else None
+    if fails:
+        # Mimecast returns errors in the 'fail' array even on HTTP 200
+        raise Exception("Mimecast error: " + json.dumps(fails))
+    return resp
+
+
+def _run(fn):
+    try:
+        print(json.dumps(fn(_cfg(), _inputs())))
+    except urllib.error.HTTPError as e:
+        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
+        sys.exit(1)
+    except Exception as e:
+        print(json.dumps({"error": str(e)}))
+        sys.exit(1)
+
+
+def main(cfg, inputs):
+    sender = inputs.get("sender")
+    if not sender:
+        raise Exception("sender is required")
+    recipient = inputs.get("recipient")
+    if not recipient:
+        raise Exception("recipient is required")
+    action = inputs.get("action")
+
+    payload = {
+        "sender": sender,
+        "to": recipient,
+        "action": action or "block",
+    }
+    return call("/api/managedsender/permit-or-block-sender", cfg, payload)
+
+
+_run(main)
diff --git a/integrations/mimecast/scripts/create_managed_url.py b/integrations/mimecast/scripts/create_managed_url.py
new file mode 100644
index 0000000..8186eeb
--- /dev/null
+++ b/integrations/mimecast/scripts/create_managed_url.py
@@ -0,0 +1,77 @@
+import json, os, sys, hmac, hashlib, base64, uuid, datetime
+import urllib.request, urllib.error
+
+
+def _cfg():
+    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+
+
+def _inputs():
+    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
+
+
+def call(uri, cfg, data_payload=None):
+    base_url = str(cfg.get("base_url", "")).rstrip("/")
+    app_id = str(cfg.get("app_id", ""))
+    app_key = str(cfg.get("app_key", ""))
+    access_key = str(cfg.get("access_key", ""))
+    secret_key = str(cfg.get("secret_key", ""))
+
+    request_id = str(uuid.uuid4())
+    hdr_date = datetime.datetime.utcnow().strftime("%a, %d %b %Y %H:%M:%S UTC")
+    to_sign = hdr_date + ":" + request_id + ":" + uri + ":" + app_key
+    sig = base64.b64encode(
+        hmac.new(base64.b64decode(secret_key), to_sign.encode("utf-8"), hashlib.sha1).digest()
+    ).decode("utf-8")
+
+    headers = {
+        "Authorization": "MC " + access_key + ":" + sig,
+        "x-mc-app-id": app_id,
+        "x-mc-date": hdr_date,
+        "x-mc-req-id": request_id,
+        "Content-Type": "application/json",
+        "Accept": "application/json",
+    }
+    body = {"data": [data_payload] if data_payload is not None else []}
+    req = urllib.request.Request(base_url + uri, data=json.dumps(body).encode("utf-8"), headers=headers, method="POST")
+    with urllib.request.urlopen(req, timeout=60) as r:
+        raw = r.read()
+        resp = json.loads(raw) if raw else {}
+    fails = resp.get("fail") if isinstance(resp, dict) else None
+    if fails:
+        # Mimecast returns errors in the 'fail' array even on HTTP 200
+        raise Exception("Mimecast error: " + json.dumps(fails))
+    return resp
+
+
+def _run(fn):
+    try:
+        print(json.dumps(fn(_cfg(), _inputs())))
+    except urllib.error.HTTPError as e:
+        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
+        sys.exit(1)
+    except Exception as e:
+        print(json.dumps({"error": str(e)}))
+        sys.exit(1)
+
+
+def main(cfg, inputs):
+    url = inputs.get("url")
+    if not url:
+        raise Exception("url is required")
+    action = inputs.get("action")
+    match_type = inputs.get("match_type")
+
+    payload = {
+        "url": url,
+        "action": action or "block",
+        "matchType": match_type or "explicit",
+    }
+    comment = inputs.get("comment")
+    if comment:
+        payload["comment"] = comment
+
+    return call("/api/ttp/url/create-managed-url", cfg, payload)
+
+
+_run(main)
diff --git a/integrations/mimecast/scripts/create_remediation.py b/integrations/mimecast/scripts/create_remediation.py
new file mode 100644
index 0000000..8373621
--- /dev/null
+++ b/integrations/mimecast/scripts/create_remediation.py
@@ -0,0 +1,76 @@
+import json, os, sys, hmac, hashlib, base64, uuid, datetime
+import urllib.request, urllib.error
+
+
+def _cfg():
+    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+
+
+def _inputs():
+    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
+
+
+def call(uri, cfg, data_payload=None):
+    base_url = str(cfg.get("base_url", "")).rstrip("/")
+    app_id = str(cfg.get("app_id", ""))
+    app_key = str(cfg.get("app_key", ""))
+    access_key = str(cfg.get("access_key", ""))
+    secret_key = str(cfg.get("secret_key", ""))
+
+    request_id = str(uuid.uuid4())
+    hdr_date = datetime.datetime.utcnow().strftime("%a, %d %b %Y %H:%M:%S UTC")
+    to_sign = hdr_date + ":" + request_id + ":" + uri + ":" + app_key
+    sig = base64.b64encode(
+        hmac.new(base64.b64decode(secret_key), to_sign.encode("utf-8"), hashlib.sha1).digest()
+    ).decode("utf-8")
+
+    headers = {
+        "Authorization": "MC " + access_key + ":" + sig,
+        "x-mc-app-id": app_id,
+        "x-mc-date": hdr_date,
+        "x-mc-req-id": request_id,
+        "Content-Type": "application/json",
+        "Accept": "application/json",
+    }
+    body = {"data": [data_payload] if data_payload is not None else []}
+    req = urllib.request.Request(base_url + uri, data=json.dumps(body).encode("utf-8"), headers=headers, method="POST")
+    with urllib.request.urlopen(req, timeout=60) as r:
+        raw = r.read()
+        resp = json.loads(raw) if raw else {}
+    fails = resp.get("fail") if isinstance(resp, dict) else None
+    if fails:
+        # Mimecast returns errors in the 'fail' array even on HTTP 200
+        raise Exception("Mimecast error: " + json.dumps(fails))
+    return resp
+
+
+def _run(fn):
+    try:
+        print(json.dumps(fn(_cfg(), _inputs())))
+    except urllib.error.HTTPError as e:
+        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
+        sys.exit(1)
+    except Exception as e:
+        print(json.dumps({"error": str(e)}))
+        sys.exit(1)
+
+
+def main(cfg, inputs):
+    message_hash = inputs.get("message_hash")
+    message_id = inputs.get("message_id")
+    if not message_hash and not message_id:
+        raise Exception("message_hash or message_id is required")
+
+    payload = {}
+    if message_hash:
+        payload["hash"] = message_hash
+    if message_id:
+        payload["messageId"] = message_id
+    reason = inputs.get("reason")
+    if reason:
+        payload["reason"] = reason
+
+    return call("/api/ttp/remediation/create", cfg, payload)
+
+
+_run(main)
diff --git a/integrations/mimecast/scripts/decode_url.py b/integrations/mimecast/scripts/decode_url.py
new file mode 100644
index 0000000..d31e10c
--- /dev/null
+++ b/integrations/mimecast/scripts/decode_url.py
@@ -0,0 +1,65 @@
+import json, os, sys, hmac, hashlib, base64, uuid, datetime
+import urllib.request, urllib.error
+
+
+def _cfg():
+    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+
+
+def _inputs():
+    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
+
+
+def call(uri, cfg, data_payload=None):
+    base_url = str(cfg.get("base_url", "")).rstrip("/")
+    app_id = str(cfg.get("app_id", ""))
+    app_key = str(cfg.get("app_key", ""))
+    access_key = str(cfg.get("access_key", ""))
+    secret_key = str(cfg.get("secret_key", ""))
+
+    request_id = str(uuid.uuid4())
+    hdr_date = datetime.datetime.utcnow().strftime("%a, %d %b %Y %H:%M:%S UTC")
+    to_sign = hdr_date + ":" + request_id + ":" + uri + ":" + app_key
+    sig = base64.b64encode(
+        hmac.new(base64.b64decode(secret_key), to_sign.encode("utf-8"), hashlib.sha1).digest()
+    ).decode("utf-8")
+
+    headers = {
+        "Authorization": "MC " + access_key + ":" + sig,
+        "x-mc-app-id": app_id,
+        "x-mc-date": hdr_date,
+        "x-mc-req-id": request_id,
+        "Content-Type": "application/json",
+        "Accept": "application/json",
+    }
+    body = {"data": [data_payload] if data_payload is not None else []}
+    req = urllib.request.Request(base_url + uri, data=json.dumps(body).encode("utf-8"), headers=headers, method="POST")
+    with urllib.request.urlopen(req, timeout=60) as r:
+        raw = r.read()
+        resp = json.loads(raw) if raw else {}
+    fails = resp.get("fail") if isinstance(resp, dict) else None
+    if fails:
+        # Mimecast returns errors in the 'fail' array even on HTTP 200
+        raise Exception("Mimecast error: " + json.dumps(fails))
+    return resp
+
+
+def _run(fn):
+    try:
+        print(json.dumps(fn(_cfg(), _inputs())))
+    except urllib.error.HTTPError as e:
+        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
+        sys.exit(1)
+    except Exception as e:
+        print(json.dumps({"error": str(e)}))
+        sys.exit(1)
+
+
+def main(cfg, inputs):
+    url = inputs.get("url")
+    if not url:
+        raise Exception("url is required")
+    return call("/api/ttp/url/decode-url", cfg, {"url": url})
+
+
+_run(main)
diff --git a/integrations/mimecast/scripts/get_message_info.py b/integrations/mimecast/scripts/get_message_info.py
new file mode 100644
index 0000000..dbabd95
--- /dev/null
+++ b/integrations/mimecast/scripts/get_message_info.py
@@ -0,0 +1,65 @@
+import json, os, sys, hmac, hashlib, base64, uuid, datetime
+import urllib.request, urllib.error
+
+
+def _cfg():
+    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+
+
+def _inputs():
+    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
+
+
+def call(uri, cfg, data_payload=None):
+    base_url = str(cfg.get("base_url", "")).rstrip("/")
+    app_id = str(cfg.get("app_id", ""))
+    app_key = str(cfg.get("app_key", ""))
+    access_key = str(cfg.get("access_key", ""))
+    secret_key = str(cfg.get("secret_key", ""))
+
+    request_id = str(uuid.uuid4())
+    hdr_date = datetime.datetime.utcnow().strftime("%a, %d %b %Y %H:%M:%S UTC")
+    to_sign = hdr_date + ":" + request_id + ":" + uri + ":" + app_key
+    sig = base64.b64encode(
+        hmac.new(base64.b64decode(secret_key), to_sign.encode("utf-8"), hashlib.sha1).digest()
+    ).decode("utf-8")
+
+    headers = {
+        "Authorization": "MC " + access_key + ":" + sig,
+        "x-mc-app-id": app_id,
+        "x-mc-date": hdr_date,
+        "x-mc-req-id": request_id,
+        "Content-Type": "application/json",
+        "Accept": "application/json",
+    }
+    body = {"data": [data_payload] if data_payload is not None else []}
+    req = urllib.request.Request(base_url + uri, data=json.dumps(body).encode("utf-8"), headers=headers, method="POST")
+    with urllib.request.urlopen(req, timeout=60) as r:
+        raw = r.read()
+        resp = json.loads(raw) if raw else {}
+    fails = resp.get("fail") if isinstance(resp, dict) else None
+    if fails:
+        # Mimecast returns errors in the 'fail' array even on HTTP 200
+        raise Exception("Mimecast error: " + json.dumps(fails))
+    return resp
+
+
+def _run(fn):
+    try:
+        print(json.dumps(fn(_cfg(), _inputs())))
+    except urllib.error.HTTPError as e:
+        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
+        sys.exit(1)
+    except Exception as e:
+        print(json.dumps({"error": str(e)}))
+        sys.exit(1)
+
+
+def main(cfg, inputs):
+    message_id = inputs.get("message_id")
+    if not message_id:
+        raise Exception("message_id is required")
+    return call("/api/message-finder/get-message-info", cfg, {"id": message_id})
+
+
+_run(main)
diff --git a/integrations/mimecast/scripts/list_held_messages.py b/integrations/mimecast/scripts/list_held_messages.py
new file mode 100644
index 0000000..335a187
--- /dev/null
+++ b/integrations/mimecast/scripts/list_held_messages.py
@@ -0,0 +1,72 @@
+import json, os, sys, hmac, hashlib, base64, uuid, datetime
+import urllib.request, urllib.error
+
+
+def _cfg():
+    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+
+
+def _inputs():
+    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
+
+
+def call(uri, cfg, data_payload=None):
+    base_url = str(cfg.get("base_url", "")).rstrip("/")
+    app_id = str(cfg.get("app_id", ""))
+    app_key = str(cfg.get("app_key", ""))
+    access_key = str(cfg.get("access_key", ""))
+    secret_key = str(cfg.get("secret_key", ""))
+
+    request_id = str(uuid.uuid4())
+    hdr_date = datetime.datetime.utcnow().strftime("%a, %d %b %Y %H:%M:%S UTC")
+    to_sign = hdr_date + ":" + request_id + ":" + uri + ":" + app_key
+    sig = base64.b64encode(
+        hmac.new(base64.b64decode(secret_key), to_sign.encode("utf-8"), hashlib.sha1).digest()
+    ).decode("utf-8")
+
+    headers = {
+        "Authorization": "MC " + access_key + ":" + sig,
+        "x-mc-app-id": app_id,
+        "x-mc-date": hdr_date,
+        "x-mc-req-id": request_id,
+        "Content-Type": "application/json",
+        "Accept": "application/json",
+    }
+    body = {"data": [data_payload] if data_payload is not None else []}
+    req = urllib.request.Request(base_url + uri, data=json.dumps(body).encode("utf-8"), headers=headers, method="POST")
+    with urllib.request.urlopen(req, timeout=60) as r:
+        raw = r.read()
+        resp = json.loads(raw) if raw else {}
+    fails = resp.get("fail") if isinstance(resp, dict) else None
+    if fails:
+        # Mimecast returns errors in the 'fail' array even on HTTP 200
+        raise Exception("Mimecast error: " + json.dumps(fails))
+    return resp
+
+
+def _run(fn):
+    try:
+        print(json.dumps(fn(_cfg(), _inputs())))
+    except urllib.error.HTTPError as e:
+        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
+        sys.exit(1)
+    except Exception as e:
+        print(json.dumps({"error": str(e)}))
+        sys.exit(1)
+
+
+def main(cfg, inputs):
+    admin = inputs.get("admin")
+    if admin is None:
+        admin = True
+    limit = inputs.get("limit")
+    if limit is None:
+        limit = 100
+    payload = {
+        "admin": bool(admin),
+        "pagination": {"pageSize": int(limit)},
+    }
+    return call("/api/gateway/get-hold-message-list", cfg, payload)
+
+
+_run(main)
diff --git a/integrations/mimecast/scripts/list_managed_urls.py b/integrations/mimecast/scripts/list_managed_urls.py
new file mode 100644
index 0000000..475d73c
--- /dev/null
+++ b/integrations/mimecast/scripts/list_managed_urls.py
@@ -0,0 +1,62 @@
+import json, os, sys, hmac, hashlib, base64, uuid, datetime
+import urllib.request, urllib.error
+
+
+def _cfg():
+    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+
+
+def _inputs():
+    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
+
+
+def call(uri, cfg, data_payload=None):
+    base_url = str(cfg.get("base_url", "")).rstrip("/")
+    app_id = str(cfg.get("app_id", ""))
+    app_key = str(cfg.get("app_key", ""))
+    access_key = str(cfg.get("access_key", ""))
+    secret_key = str(cfg.get("secret_key", ""))
+
+    request_id = str(uuid.uuid4())
+    hdr_date = datetime.datetime.utcnow().strftime("%a, %d %b %Y %H:%M:%S UTC")
+    to_sign = hdr_date + ":" + request_id + ":" + uri + ":" + app_key
+    sig = base64.b64encode(
+        hmac.new(base64.b64decode(secret_key), to_sign.encode("utf-8"), hashlib.sha1).digest()
+    ).decode("utf-8")
+
+    headers = {
+        "Authorization": "MC " + access_key + ":" + sig,
+        "x-mc-app-id": app_id,
+        "x-mc-date": hdr_date,
+        "x-mc-req-id": request_id,
+        "Content-Type": "application/json",
+        "Accept": "application/json",
+    }
+    body = {"data": [data_payload] if data_payload is not None else []}
+    req = urllib.request.Request(base_url + uri, data=json.dumps(body).encode("utf-8"), headers=headers, method="POST")
+    with urllib.request.urlopen(req, timeout=60) as r:
+        raw = r.read()
+        resp = json.loads(raw) if raw else {}
+    fails = resp.get("fail") if isinstance(resp, dict) else None
+    if fails:
+        # Mimecast returns errors in the 'fail' array even on HTTP 200
+        raise Exception("Mimecast error: " + json.dumps(fails))
+    return resp
+
+
+def _run(fn):
+    try:
+        print(json.dumps(fn(_cfg(), _inputs())))
+    except urllib.error.HTTPError as e:
+        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
+        sys.exit(1)
+    except Exception as e:
+        print(json.dumps({"error": str(e)}))
+        sys.exit(1)
+
+
+def main(cfg, inputs):
+    return call("/api/ttp/url/get-all-managed-urls", cfg, None)
+
+
+_run(main)
diff --git a/integrations/mimecast/scripts/reject_held_message.py b/integrations/mimecast/scripts/reject_held_message.py
new file mode 100644
index 0000000..61d945e
--- /dev/null
+++ b/integrations/mimecast/scripts/reject_held_message.py
@@ -0,0 +1,69 @@
+import json, os, sys, hmac, hashlib, base64, uuid, datetime
+import urllib.request, urllib.error
+
+
+def _cfg():
+    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+
+
+def _inputs():
+    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
+
+
+def call(uri, cfg, data_payload=None):
+    base_url = str(cfg.get("base_url", "")).rstrip("/")
+    app_id = str(cfg.get("app_id", ""))
+    app_key = str(cfg.get("app_key", ""))
+    access_key = str(cfg.get("access_key", ""))
+    secret_key = str(cfg.get("secret_key", ""))
+
+    request_id = str(uuid.uuid4())
+    hdr_date = datetime.datetime.utcnow().strftime("%a, %d %b %Y %H:%M:%S UTC")
+    to_sign = hdr_date + ":" + request_id + ":" + uri + ":" + app_key
+    sig = base64.b64encode(
+        hmac.new(base64.b64decode(secret_key), to_sign.encode("utf-8"), hashlib.sha1).digest()
+    ).decode("utf-8")
+
+    headers = {
+        "Authorization": "MC " + access_key + ":" + sig,
+        "x-mc-app-id": app_id,
+        "x-mc-date": hdr_date,
+        "x-mc-req-id": request_id,
+        "Content-Type": "application/json",
+        "Accept": "application/json",
+    }
+    body = {"data": [data_payload] if data_payload is not None else []}
+    req = urllib.request.Request(base_url + uri, data=json.dumps(body).encode("utf-8"), headers=headers, method="POST")
+    with urllib.request.urlopen(req, timeout=60) as r:
+        raw = r.read()
+        resp = json.loads(raw) if raw else {}
+    fails = resp.get("fail") if isinstance(resp, dict) else None
+    if fails:
+        # Mimecast returns errors in the 'fail' array even on HTTP 200
+        raise Exception("Mimecast error: " + json.dumps(fails))
+    return resp
+
+
+def _run(fn):
+    try:
+        print(json.dumps(fn(_cfg(), _inputs())))
+    except urllib.error.HTTPError as e:
+        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
+        sys.exit(1)
+    except Exception as e:
+        print(json.dumps({"error": str(e)}))
+        sys.exit(1)
+
+
+def main(cfg, inputs):
+    message_id = inputs.get("message_id")
+    if not message_id:
+        raise Exception("message_id is required")
+    payload = {"id": message_id}
+    reason = inputs.get("reason")
+    if reason:
+        payload["message"] = reason
+    return call("/api/gateway/hold-reject", cfg, payload)
+
+
+_run(main)
diff --git a/integrations/mimecast/scripts/release_held_message.py b/integrations/mimecast/scripts/release_held_message.py
new file mode 100644
index 0000000..9278242
--- /dev/null
+++ b/integrations/mimecast/scripts/release_held_message.py
@@ -0,0 +1,65 @@
+import json, os, sys, hmac, hashlib, base64, uuid, datetime
+import urllib.request, urllib.error
+
+
+def _cfg():
+    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+
+
+def _inputs():
+    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
+
+
+def call(uri, cfg, data_payload=None):
+    base_url = str(cfg.get("base_url", "")).rstrip("/")
+    app_id = str(cfg.get("app_id", ""))
+    app_key = str(cfg.get("app_key", ""))
+    access_key = str(cfg.get("access_key", ""))
+    secret_key = str(cfg.get("secret_key", ""))
+
+    request_id = str(uuid.uuid4())
+    hdr_date = datetime.datetime.utcnow().strftime("%a, %d %b %Y %H:%M:%S UTC")
+    to_sign = hdr_date + ":" + request_id + ":" + uri + ":" + app_key
+    sig = base64.b64encode(
+        hmac.new(base64.b64decode(secret_key), to_sign.encode("utf-8"), hashlib.sha1).digest()
+    ).decode("utf-8")
+
+    headers = {
+        "Authorization": "MC " + access_key + ":" + sig,
+        "x-mc-app-id": app_id,
+        "x-mc-date": hdr_date,
+        "x-mc-req-id": request_id,
+        "Content-Type": "application/json",
+        "Accept": "application/json",
+    }
+    body = {"data": [data_payload] if data_payload is not None else []}
+    req = urllib.request.Request(base_url + uri, data=json.dumps(body).encode("utf-8"), headers=headers, method="POST")
+    with urllib.request.urlopen(req, timeout=60) as r:
+        raw = r.read()
+        resp = json.loads(raw) if raw else {}
+    fails = resp.get("fail") if isinstance(resp, dict) else None
+    if fails:
+        # Mimecast returns errors in the 'fail' array even on HTTP 200
+        raise Exception("Mimecast error: " + json.dumps(fails))
+    return resp
+
+
+def _run(fn):
+    try:
+        print(json.dumps(fn(_cfg(), _inputs())))
+    except urllib.error.HTTPError as e:
+        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
+        sys.exit(1)
+    except Exception as e:
+        print(json.dumps({"error": str(e)}))
+        sys.exit(1)
+
+
+def main(cfg, inputs):
+    message_id = inputs.get("message_id")
+    if not message_id:
+        raise Exception("message_id is required")
+    return call("/api/gateway/hold-release", cfg, {"id": message_id})
+
+
+_run(main)
diff --git a/integrations/mimecast/scripts/search_messages.py b/integrations/mimecast/scripts/search_messages.py
new file mode 100644
index 0000000..331abef
--- /dev/null
+++ b/integrations/mimecast/scripts/search_messages.py
@@ -0,0 +1,80 @@
+import json, os, sys, hmac, hashlib, base64, uuid, datetime
+import urllib.request, urllib.error
+
+
+def _cfg():
+    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+
+
+def _inputs():
+    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
+
+
+def call(uri, cfg, data_payload=None):
+    base_url = str(cfg.get("base_url", "")).rstrip("/")
+    app_id = str(cfg.get("app_id", ""))
+    app_key = str(cfg.get("app_key", ""))
+    access_key = str(cfg.get("access_key", ""))
+    secret_key = str(cfg.get("secret_key", ""))
+
+    request_id = str(uuid.uuid4())
+    hdr_date = datetime.datetime.utcnow().strftime("%a, %d %b %Y %H:%M:%S UTC")
+    to_sign = hdr_date + ":" + request_id + ":" + uri + ":" + app_key
+    sig = base64.b64encode(
+        hmac.new(base64.b64decode(secret_key), to_sign.encode("utf-8"), hashlib.sha1).digest()
+    ).decode("utf-8")
+
+    headers = {
+        "Authorization": "MC " + access_key + ":" + sig,
+        "x-mc-app-id": app_id,
+        "x-mc-date": hdr_date,
+        "x-mc-req-id": request_id,
+        "Content-Type": "application/json",
+        "Accept": "application/json",
+    }
+    body = {"data": [data_payload] if data_payload is not None else []}
+    req = urllib.request.Request(base_url + uri, data=json.dumps(body).encode("utf-8"), headers=headers, method="POST")
+    with urllib.request.urlopen(req, timeout=60) as r:
+        raw = r.read()
+        resp = json.loads(raw) if raw else {}
+    fails = resp.get("fail") if isinstance(resp, dict) else None
+    if fails:
+        # Mimecast returns errors in the 'fail' array even on HTTP 200
+        raise Exception("Mimecast error: " + json.dumps(fails))
+    return resp
+
+
+def _run(fn):
+    try:
+        print(json.dumps(fn(_cfg(), _inputs())))
+    except urllib.error.HTTPError as e:
+        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
+        sys.exit(1)
+    except Exception as e:
+        print(json.dumps({"error": str(e)}))
+        sys.exit(1)
+
+
+def main(cfg, inputs):
+    from_addr = inputs.get("from")
+    to_addr = inputs.get("to")
+    subject = inputs.get("subject")
+    start = inputs.get("start")
+    end = inputs.get("end")
+
+    payload = {}
+    if from_addr:
+        payload["from"] = from_addr
+    if to_addr:
+        payload["to"] = to_addr
+    if subject:
+        payload["subject"] = subject
+    if start:
+        payload["start"] = start
+    if end:
+        payload["end"] = end
+
+    return call("/api/message-finder/search", cfg, payload)
+
+
+_run(main)
diff --git a/integrations/mimecast/scripts/test_connection.py b/integrations/mimecast/scripts/test_connection.py
new file mode 100644
index 0000000..51be228
--- /dev/null
+++ b/integrations/mimecast/scripts/test_connection.py
@@ -0,0 +1,63 @@
+import json, os, sys, hmac, hashlib, base64, uuid, datetime
+import urllib.request, urllib.error
+
+
+def _cfg():
+    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+
+
+def _inputs():
+    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
+
+
+def call(uri, cfg, data_payload=None):
+    base_url = str(cfg.get("base_url", "")).rstrip("/")
+    app_id = str(cfg.get("app_id", ""))
+    app_key = str(cfg.get("app_key", ""))
+    access_key = str(cfg.get("access_key", ""))
+    secret_key = str(cfg.get("secret_key", ""))
+
+    request_id = str(uuid.uuid4())
+    hdr_date = datetime.datetime.utcnow().strftime("%a, %d %b %Y %H:%M:%S UTC")
+    to_sign = hdr_date + ":" + request_id + ":" + uri + ":" + app_key
+    sig = base64.b64encode(
+        hmac.new(base64.b64decode(secret_key), to_sign.encode("utf-8"), hashlib.sha1).digest()
+    ).decode("utf-8")
+
+    headers = {
+        "Authorization": "MC " + access_key + ":" + sig,
+        "x-mc-app-id": app_id,
+        "x-mc-date": hdr_date,
+        "x-mc-req-id": request_id,
+        "Content-Type": "application/json",
+        "Accept": "application/json",
+    }
+    body = {"data": [data_payload] if data_payload is not None else []}
+    req = urllib.request.Request(base_url + uri, data=json.dumps(body).encode("utf-8"), headers=headers, method="POST")
+    with urllib.request.urlopen(req, timeout=60) as r:
+        raw = r.read()
+        resp = json.loads(raw) if raw else {}
+    fails = resp.get("fail") if isinstance(resp, dict) else None
+    if fails:
+        # Mimecast returns errors in the 'fail' array even on HTTP 200
+        raise Exception("Mimecast error: " + json.dumps(fails))
+    return resp
+
+
+def _run(fn):
+    try:
+        print(json.dumps(fn(_cfg(), _inputs())))
+    except urllib.error.HTTPError as e:
+        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
+        sys.exit(1)
+    except Exception as e:
+        print(json.dumps({"error": str(e)}))
+        sys.exit(1)
+
+
+def main(cfg, inputs):
+    call("/api/account/get-account", cfg, None)
+    return {"ok": True}
+
+
+_run(main)