Scenario
This scenario typically occurs where there is a hybrid environment (that is, where both Microsoft 365 and an on-premise Microsoft Exchange Server are in use), or where customers are gradually migrating from an on-premise Microsoft Exchange Server to Microsoft 365.
Duplicate signatures may occur when an Microsoft 365 user emails an on-premise Exchange user, and vice versa. Since the message is processed by both Exclaimer solutions, a signature is appended on both occasions.
Resolution
To resolve this issue, please click on the required options listed below to go through the detailed description:
To prevent a second signature from being appended by Signature Manager Exchange Edition, you must add a word or phrase exception to the appropriate signature policy (within the Signature Manager Exchange Edition).
The word or phrase you specify as an exception must be present in the signature being deployed from Exclaimer - Signatures for Microsoft 365 (for example, a company registered number).
This will result in any email sent from Microsoft Outlook with the Microsoft 365 signature already appended, to be excluded from having a second signature appended by Signature Manager Exchange Edition.
For example:
To prevent a second signature from being appended by Microsoft 365, you must add an exclusion to the signature rule in Exclaimer - Signatures for Microsoft 365.
The word or phrase that you specify must be present in the signature being deployed from Signature Manager Exchange Edition (for example, a company registered number).
For example:
