lorentz fcdec8e38b feat: Mimecast multi-tenant held mail viewer

- migration 062: mimecast_tenants table (company_id, client_id/secret, account_code)
- Seed Wulf (CUSA13A95) + Seubert (CUSA96A181) tenants
- MimecastClient.getHeldMessages(): full pagination via meta.pagination.next cursor
  (API always returns 10/page regardless of pageSize param, totalCount in meta)
- getMimecastClientForTenant() factory for per-tenant instantiation
- GET /api/mimecast/held?tenantId=&recipient= — fetches all tenants in parallel,
  merges + sorts by date, returns per-tenant counts + combined messages[]
- Held Mail tab on /admin/sync/mimecast (on-demand load, recipient filter,
  tenant badges, policy filter dropdown, DMARC/impersonation highlighted red)

2026-03-31 22:38:22 -04:00

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Mimecast

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Get Hold Message List

Documentation

In this guide:

Description

This API endpoint can be used to get information about held messages, including the reason, hold level, sender and recipients. The ID can be used to act on a message using the Release Message or Reject Message API endpoints.

Pre-requisites

In order to successfully use this endpoint the logged in user must be a Mimecast administrator with at least the Account | Dashboard | Read permission.

URI

To use this endpoint you send a POST request to:

/api/gateway/get-hold-message-list

Request Headers

The following request headers must be included in your request:

Field	Description
Authorization	Please see the Authorization guide for more information on building the Authorization header.
x-mc-req-id	A randomly generated GUID, for example, `<br>8578FCFC-A305-4D9A-99CB-F4D5ECEFE297<br>`
x-mc-app-id	The Application ID provided with your Registered API Application.
x-mc-date	The current date and time in the following format, for example, `<br>Tue, 24 Nov 2015 12:50:11 UTC<br>`

Request Body


{

 "data": [\
\
  {\
\
   "admin": true,\
\
   "start": "2015-11-16T14:49:18+0000",\
\
   "searchBy": {\
\
    "fieldName": "String",\
\
    "value": "String"\
\
   },\
\
   "end": "2015-11-16T14:49:18+0000"\
\
  }\
\
 ]

}

data

Field	Type	Required	Description
admin	Boolean	Optional	Level of results to return. If false, only results for the currenlty authenticated user will be returned. If true, held messages for all recipients will be returned. The default value is false.
searchBy	Object	Optional	Object data used to filter results
start	Date String	Optional	The date and time of the earliest message to return, in the following format, 2011-12-03T10:15:30+0000
end	Date String	Optional	The date and time of the latest message to return, in the following format, 2011-12-03T10:15:30+0000

searchBy

Field	Type	Required	Description
value	String	Optional	The text used to filter results
fieldName	String	Optional	Message fields to filter based on. Possible values are: all, subject, sender, recipient, reason_code

Response


{

 "fail": [],

 "meta": {

  "status": 200

 },

 "data": [\
\
  {\
\
   "dateReceived": "String",\
\
   "reason": "String",\
\
   "reasonCode": "String",\
\
   "id": "String",\
\
   "size": 1000,\
\
   "from": {\
\
    "displayableName": "String",\
\
    "emailAddress": "String"\
\
   },\
\
   "hasAttachments": "true",\
\
   "route": "String",\
\
   "policyInfo": "String",\
\
   "fromHeader": {\
\
    "displayableName": "String",\
\
    "emailAddress": "String"\
\
   },\
\
   "to": {\
\
    "displayableName": "String",\
\
    "emailAddress": "String"\
\
   },\
\
   "reasonId": "String",\
\
   "subject": "String"\
\
  }\
\
 ]

}

meta object

Field	Type	Description
status	Number	The function level status of the request.

data

Field	Type	Description
id	String	The Mimecast secure ID for a message
reason	String	The summary reason for holding the message
reasonId	String	Mirrors the reason field, formatted without spaces. However, reasonCode should be used instead
reasonCode	String	Reason code for holding the message
from	Object	Contains the envelope sender information
fromHeader	Object	Contains the header sender information
to	Object	Contains the envelope recipient information
toHeader	Object	Contains the header recipient information
subject	String	The message subject
route	String	Direction of message being held. Possible values are: INBOUND, OUTBOUND, INTERNAL, EXTERNAL
hasAttachments	Boolean	Returns true if the message contains attachments. False indicates no attachments
size	Integer	The size of the message in bytes
dateReceived	Date String	The timestamp of the message transmission
policyInfo	String	Information or definition name triggering the message hold action

Sample Code

Sample code is provided to demonstrate how to use the API and is not representative of a production application. To use the sample code; complete the required variables as described, populate the desired values in the request body, and execute in your favorite IDE. Please see the Global Base URL's page to find the correct base URL to use for your account.

HTTPPythonC#PowerShellJava


POST {base_url}/api/gateway/get-hold-message-list

Authorization: MC {accesskKey}:{Base64 encoded signed Data To Sign}

x-mc-date: {dateTime}

x-mc-req-id: {unique id}

x-mc-app-id: {applicationId}

Content-Type: application/json

Accept: application/json



{

  "data":[\
\
    {\
\
        "data":[\
\
            {\
\
                "searchBy": {\
\
                    "value": "String",\
\
                    "fieldName": "String"\
\
                },\
\
                "start": "2015-11-16T14:49:18+0000",\
\
                "admin": true,\
\
                "end": "2015-11-16T14:49:18+0000"\
\
            }\
\
        ]\
\
    }\
\
  ]

}


import base64

import hashlib

import hmac

import uuid

import datetime

import requests



# Setup required variables

base_url = "https://xx-api.mimecast.com"

uri = "/api/gateway/get-hold-message-list"

url = base_url + uri

access_key = "YOUR ACCESS KEY"

secret_key = "YOUR SECRET KEY"

app_id = "YOUR APPLICATION ID"

app_key = "YOUR APPLICATION KEY"



# Generate request header values

request_id = str(uuid.uuid4())

hdr_date = datetime.datetime.utcnow().strftime("%a, %d %b %Y %H:%M:%S") + " UTC"



# DataToSign is used in hmac_sha1

dataToSign = ':'.join([hdr_date, request_id, uri, app_key])



# Create the HMAC SHA1 of the Base64 decoded secret key for the Authorization header

hmac_sha1 = hmac.new(base64.b64decode(secret_key), dataToSign.encode(), digestmod=hashlib.sha1).digest()



# Use the HMAC SHA1 value to sign the hdrDate + ":" requestId + ":" + URI + ":" + appkey

sig = base64.b64encode(hmac_sha1).rstrip()



# Create request headers

headers = {

    'Authorization': 'MC ' + access_key + ':' + sig.decode(),

    'x-mc-app-id': app_id,

    'x-mc-date': hdr_date,

    'x-mc-req-id': request_id,

    'Content-Type': 'application/json'

}



payload = {

        'data': [\
\
            {\
\
                "searchBy": {\
\
                    "value": "String",\
\
                    "fieldName": "String"\
\
                },\
\
                "start": "2015-11-16T14:49:18+0000",\
\
                "admin": true,\
\
                "end": "2015-11-16T14:49:18+0000"\
\
            }\
\
        ]

    }



r = requests.post(url=url, headers=headers, data=str(payload))



print(r.text)


static void Main(string[] args)

        {

            //Setup required variables

            string baseUrl = "https://xx-api.mimecast.com";

            string uri = "/api/gateway/get-hold-message-list";

            string accessKey = "YOUR ACCESS KEY";

            string secretKey = "YOUR SECRET KEY";

            string appId = "YOUR APPLICATION ID";

            string appKey = "YOUR APPLICATION KEY";



            //Generate request header values

            string hdrDate = System.DateTime.Now.ToUniversalTime().ToString("R");

            string requestId = System.Guid.NewGuid().ToString();



            //Create the HMAC SHA1 of the Base64 decoded secret key for the Authorization header

            System.Security.Cryptography.HMAC h = new System.Security.Cryptography.HMACSHA1(System.Convert.FromBase64String(secretKey));



            //Use the HMAC SHA1 value to sign the hdrDate + ":" requestId + ":" + URI + ":" + appkey

            byte[] hash = h.ComputeHash(System.Text.Encoding.Default.GetBytes(hdrDate + ":" + requestId + ":" + uri + ":" + appKey));



            //Build the signature to be included in the Authorization header in your request

            string signature = "MC " + accessKey + ":" + System.Convert.ToBase64String(hash);



            //Build Request

            System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(baseUrl + uri);

            request.Method = "POST";

            request.ContentType = "application/json";



            //Add Headers

            request.Headers[System.Net.HttpRequestHeader.Authorization] = signature;

            request.Headers.Add("x-mc-date", hdrDate);

            request.Headers.Add("x-mc-req-id", requestId);

            request.Headers.Add("x-mc-app-id", appId);



            //Add request body

            //Create and write data to stream

            string postData = @"{

                    ""data"": [\
\
                        {\
\
                            ""searchBy"": {\
\
                                ""value"": ""String"",\
\
                                ""fieldName"": ""String""\
\
                            },\
\
                            ""start"": ""2015-11-16T14:49:18+0000"",\
\
                            ""admin"": true,\
\
                            ""end"": ""2015-11-16T14:49:18+0000""\
\
                        }\
\
                    ]

                }";



            byte[] payload = System.Text.Encoding.UTF8.GetBytes(postData);



            System.IO.Stream stream = request.GetRequestStream();

            stream.Write(payload, 0, payload.Length);

            stream.Close();



            //Send Request

            System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();



            //Output response to console

            System.IO.StreamReader reader = new System.IO.StreamReader(response.GetResponseStream());

            string responseBody = "";

            string temp = null;

            while ((temp = reader.ReadLine()) != null)

            {

                responseBody += temp;

            };

            System.Console.WriteLine(responseBody);

            System.Console.ReadLine();

        }


#Setup required variables

$baseUrl = "https://xx-api.mimecast.com"

$uri = "/api/gateway/get-hold-message-list"

$url = $baseUrl + $uri

$accessKey = "YOUR ACCESS KEY"

$secretKey = "YOUR SECRET KEY"

$appId = "YOUR APPLICATION ID"

$appKey = "YOUR APPLICATION KEY"



#Generate request header values

$hdrDate = (Get-Date).ToUniversalTime().ToString("ddd, dd MMM yyyy HH:mm:ss UTC")

$requestId = [guid]::NewGuid().guid



#Create the HMAC SHA1 of the Base64 decoded secret key for the Authorization header

$sha = New-Object System.Security.Cryptography.HMACSHA1

$sha.key = [Convert]::FromBase64String($secretKey)

$sig = $sha.ComputeHash([Text.Encoding]::UTF8.GetBytes($hdrDate + ":" + $requestId + ":" + $uri + ":" + $appKey))

$sig = [Convert]::ToBase64String($sig)



#Create Headers

$headers = @{"Authorization" = "MC " + $accessKey + ":" + $sig;

                "x-mc-date" = $hdrDate;

                "x-mc-app-id" = $appId;

                "x-mc-req-id" = $requestId;

                "Content-Type" = "application/json"}



#Create post body

$postBody = "{

                    ""data"": [\
\
                        {\
\
                            ""searchBy"": {\
\
                                ""value"": ""String"",\
\
                                ""fieldName"": ""String""\
\
                            },\
\
                            ""start"": ""2015-11-16T14:49:18+0000"",\
\
                            ""admin"": true,\
\
                            ""end"": ""2015-11-16T14:49:18+0000""\
\
                        }\
\
                    ]

                }"



#Send Request

$response = Invoke-RestMethod -Method Post -Headers $headers -Body $postBody -Uri $url



#Print the response

$response


public static void main(String[] args) throws java.io.IOException, java.security.NoSuchAlgorithmException, java.security.InvalidKeyException {



        //set up variables for request

        String baseUrl = "https://xx-api.mimecast.com";

        String uri = "/api/gateway/get-hold-message-list";

        String url = "https://" + baseUrl + uri;

        String accessKey = "YOUR ACCESS KEY";

        String secretKey = "YOUR SECRET KEY";

        String appId = "YOUR APPLICATION ID";

        String appKey = "YOUR APPLICATION KEY";



        //create URL object

        java.net.URL obj = new java.net.URL(url);



        // set guid for x-mc-req-id header

        String guid = java.util.UUID.randomUUID().toString();



        // set date for x-mc-date header

        java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss z");

        sdf.setTimeZone(java.util.TimeZone.getTimeZone("UTC"));

        String date = sdf.format(new java.util.Date());



        //create signature for the Authorization header

        String dataToSign = date + ":" + guid + ":" + uri + ":" + appKey;

        String hmacSHA1 = "HmacSHA1";

        javax.crypto.spec.SecretKeySpec signingKey = new javax.crypto.spec.SecretKeySpec(org.apache.commons.codec.binary.Base64.decodeBase64(secretKey.getBytes()), hmacSHA1);

        javax.crypto.Mac mac = javax.crypto.Mac.getInstance(hmacSHA1);

        mac.init(signingKey);

        String sig = new String(org.apache.commons.codec.binary.Base64.encodeBase64(mac.doFinal(dataToSign.getBytes())));



        // create request object

        javax.net.ssl.HttpsURLConnection con = (javax.net.ssl.HttpsURLConnection) obj.openConnection();



        //set request type to POST

        con.setRequestMethod("POST");

        con.setDoOutput(true);



        //add reuqest headers

        con.setRequestProperty("Authorization", "MC " + accessKey + ":" + sig);

        con.setRequestProperty("x-mc-req-id", guid);

        con.setRequestProperty("x-mc-app-id", appId);

        con.setRequestProperty("x-mc-date", date);

        con.setRequestProperty("Content-Type", "application/json");

        con.setRequestProperty("Accept", "application/json");



        //Add post body to the request

        String postBody = "{\n" +

        " \"data\": [\n" +\
\
        "     {\n" +\
\
        "          \"searchBy\": {\n" +\
\
        "               \"value\": \"String\",\n" +\
\
        "               \"fieldName\": \"String\"\n" +\
\
        "          }\n" +\
\
        "          \"start\": \"2015-11-16T14:49:18+0000\",\n" +\
\
        "          \"admin\": true,\n" +\
\
        "          \"end\": \"2015-11-16T14:49:18+0000\"\n" +\
\
        "     }\n" +\
\
        " ]\n" +

        "}";

        java.io.OutputStream os = con.getOutputStream();

        os.write(postBody.getBytes("UTF-8"));

        os.close();



        //process response

        java.io.BufferedReader in = new java.io.BufferedReader(

                new java.io.InputStreamReader(con.getInputStream()));

        String inputLine;

        StringBuffer response = new StringBuffer();



        while ((inputLine = in.readLine()) != null) {

            response.append(inputLine);

        }

        in.close();



        //return result

        java.lang.System.out.println(response.toString());

    }