Trustwave is the only vendor featured in six Gartner® Market Guides. Learn More

Trustwave is the only vendor featured in six Gartner® Market Guides. Learn More

Services
Managed Detection & Response

Eliminate active threats with 24/7 threat detection, investigation, and response.

Co-Managed SOC (SIEM)

Maximize your SIEM investment, stop alert fatigue, and enhance your team with hybrid security operations support.

Advisory & Diagnostics

Advance your cybersecurity program and get expert guidance where you need it most.

Penetration Testing

Test your physical locations and IT infrastructure to shore up weaknesses before exploitation.

Database Security

Prevent unauthorized access and exceed compliance requirements.

Email Security

Stop email threats others miss and secure your organization against the #1 ransomware attack vector.

Digital Forensics & Incident Response

Prepare for the inevitable with 24/7 global breach response in-region and available on-site.

Firewall & Technology Management

Mitigate risk of a cyberattack with 24/7 incident and health monitoring and the latest threat intelligence.

View All Trustwave Services
Solutions
BY INDUSTRY
BY REGULATION
BY TOPIC
Microsoft Security
Unlock the full power of Microsoft Security
Offensive Security
Solutions to maximize your security ROI
Rapidly Secure New Environments
Security for rapid response situations
Securing the Cloud
Safely navigate and stay protected
Securing the IoT Landscape
Test, monitor and secure network objects
Why Trustwave
About Us
We reduce cyber risk and fortify organizations
Awards and Accolades
Recognition by analysts and media outlets
Trustwave SpiderLabs Team
Global researchers, ethical hackers, and responders
Trustwave Fusion Security Operations Platform
Unprecedented security visibility and control
Trustwave Security Colony
Access to cybersecurity threat protection resources
Partners
Microsoft Security
Unlock the full power of Microsoft Security
Trustwave PartnerOne Program
Join forces with Trustwave to protect against the most advance cybersecurity threats
Register
Login
Resources
BLOGS
UPCOMING
MEDIA & ASSETS
NOTICES
HELP
  1. Support
  2. MailMarshal Cloud
  3. Knowledge Base

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

 

This article applies to:

  • Trustwave 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 Trustwave 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' 

Trustwave MailMarshal Cloud KB article Q21244

Last Modified: May 25, 2025

 Turn On Turn Off Highlight