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Mail Routing Domain

  1. Exclaimer Knowledge Base
  2. User Manual
  3. Settings
  4. Mail Flow
Payal Arya
  • Updated

Description

This setting is an essential part of the Server-Side mail routing configuration. An Exclaimer Administrator can to configure how Exclaimer routes email back to Microsoft 365 after processing.

You might need to change the setting in complex environments, such as multi-geo Microsoft 365 tenants.

Pre-requisite:
The Mail Routing Domain setting requires an Exclaimer Admin account to view and edit the setting.

How to access it?

To access the Mail Routing option: 

  1. From the header bar, select the cogwheel icon, then select Mail Flow.



  2. Navigate the Mail Routing Domain section. 


    Mail Routing Domain section

Configuring Mail Routing

To configure mail routing options:

  1. In Domain Name, enter the domain where the email should be routed after being processed by Exclaimer.
    We recommend: Use the .onmicrosoft.com domain which can be located in the Domains list in the Microsoft 365 Admin Center: Microsoft 365 Admin Center. This setting is important, and an incorrect domain can result in mail flow issues.


    Enter Domain Name

    NOTES:

    Email is routed back to a mail server identified from the specified domain's MX DNS record.

    To ensure that the email is routed successfully after being processed by Exclaimer, it is necessary to specify a domain with an MX record that points towards a Microsoft Exchange Online server for your organization.

    The MX record for the Domain name (in the Mail Routing Domain settings) should specify a single Exchange Online Server for your Microsoft 365 tenancy.

    To check the MX record for your own Domain name, use a DNS lookup tool, such as MXToolbox.



    Example showing Exclaimer's domain name

  2. Select SAVE to save your mail routing settings.
If your current subscription already has the Sender Domain option enabled, then the options will be slightly different

Sender Domain (is not recommended): This uses the domain part of the sender's email address to deliver the mail to a mail server identified from that domain's DNS record.

- This option should not be used for organizations where a third-party service is configured for receiving inbound mail.

- The MX record for the domain must point towards a Microsoft Exchange Online server for an email to be successfully routed back from Exclaimer after processing.



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Have you got a question? Take a look at our Frequently Asked Questions page.