Disable the Signature 365 server-side mail flow rule file

Scenario

In some rare circumstances (such as a 3rd party outage affecting server-side injection) it is possible to disable the mailflow rule sending emails to Signature 365 for signature injection.

Disabling the mailflow rule will allow server-side email to reach the recipient until the incident is resolved, but will prevent a signature from being inserted by the server-side process.

Once the incident is resolved, the mailflow rule can be re-enabled to again insert signatures.

Solution

You can follow the details below to disable the server-side rule

• Login to the Microsoft Exchange admin centre Microsoft Exchange Admin Centre
• Select the Mail flow option from the menu
• Select the Rules option
• Locate the rule named Send to Signature 365 for signature injection and select it
• Disable the rule

This will prevent email being routed to Signature 365 for server-side injection. When the support team advise the issue is resolved, the rule can be re-enabled following the same process.