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INFO: Mail Flow Connectors and Rules for MailMarshal Cloud Integrated Mode

 

This article applies to:

  • MailMarshal Cloud (M365 Integrated Mode)

Question:

  • What Connectors and Rules are automatically created in the M365 environment by MailMarshal Cloud Integrated Mode provisioning?

Information:

MailMarshal Cloud creates the following items in M365 Mail Flow. The items are created below any existing items.

When created, both connectors are enabled and both rules are disbled. Messages will not be passed to MailMarshal Cloud.

For the service to work correctly, all items must be present and enabled.

Connectors

From MailMarshal Cloud Integrated
This connector instructs Exchange to accept all messages from the MailMarshal Cloud instance.
  • From: Your organization's Mail Server
  • To Office 365
  • How to identify email sent from your email server:
    • Subject name on the certificate matches *.[region].mailmarshal.cloud
      • Where [region] is the regional instance configured for the customer and is one of the following: (au eu us)
To MailMarshal Cloud Integrated
This connector allows messages to be routed to the MailMarshal Cloud instance by the Transport Rule.
  • From: Office 365
  • To: Partner organization
  • Use only when I have a transport rule set up that redirects messages to this connector
  • Route email messages through these smart hosts:
    • Set the value for the regional instance configured for the customer:
      • AU: m365integrated-array-1.au.mailmarshal.cloud
      • EU: m365integrated-array-1.eu.mailmarshal.cloud
      • US: m365integrated-array-1.us.mailmarshal.cloud
  • Security restrictions:
    • Always use TLS
    • Server certificate issued by a trusted CA and the subject name is: *.[region].mailmarshal.cloud
      • Where [region] is the regional instance configured for the customer and is one of the following: (au eu us)

Rules

MailMarshal Cloud Integrated Loop Check
This rule helps to prevent re-delivery of incorrectly routed messages.
  • Apply this rule if the  'X-MMCloud-ID'  message header includes  (GUID value)
    • The value in the header is unique for each customer. If you have deleted this rule, contact LevelBlue for assistance.
  • Remove the header 'X-MMCloud-ID' 
MailMarshal Cloud Integrated Redirect
This rule routes messages to MailMarshal Cloud for scanning.
  • Apply to all messages
  • Route the message using the following connector: 'To MailMarshal Cloud Integrated' 

MailMarshal Cloud KB article Q21244

Last Modified: May 25, 2025

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