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How to deconfigure or disable Server-Side signatures for Microsoft 365

  1. Exclaimer Knowledge Base
  2. Solutions
  3. Setup
Ari Flavell
  • Updated

Scenario

You want to temporarily or permanently stop emails from your organization routing to Exclaimer to have Server-Side signatures applied. This may be because you are troubleshooting a mail flow issue, no longer wish to use Server-Side signatures, or have cancelled your Exclaimer subscription.

NOTE: This solution is not the same as uninstalling Exclaimer. This only stops Exclaimer handling Server-Side signatures for your emails. For instructions on uninstalling, see Uninstall Exclaimer with Microsoft 365.

Resolution

You can temporarily disable Server-Side signatures by deactivating the Transport Rule that route emails to Exclaimer for processing. To permanently remove the configuration for Server-Side signatures, you must remove the Transport Rules and connectors. If you have cancelled your Exclaimer subscription and are removing Exclaimer from your environment, you also need to remove the Entra apps and Exclaimer domain.

NOTES: Once you undo the configuration for Server-Side signatures, emails will not be routed to Exclaimer and signatures will not be added.
If you wish to re-enable Server-Side signatures, you will have to complete the configuration process again.

To temporarily disable Server-Side signatures for Exclaimer:

Deactivate the Transport Rule 

To deactive the Transport Rule:

  1. Log in to the Exchange admin center using your Microsoft 365 Administrator credentials.
     
  2. From the navigation menu, select Mail flow, then select Rules.
     
  3.  Locate and select the Identify messages to send to Exclaimer Cloud rule from the Rules list.


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  4. Select the Enable or disable rule toggle to set it to Disabled.


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    This may take a few moments to update.

    To reactivate Server-Side signatures after disabling, set the toggle to Enabled. 

To uninstall Server-Side signatures for Exclaimer:

Step 1: Delete the Transport Rules
WARNING! This cannot be undone. Deleting the transport rules is permanent.

To permanently delete the Transport Rules:

  1. Log in to the Exchange admin center using your Microsoft 365 Administrator credentials.
     
  2. From the navigation menu, select Mail flow, then select Rules.
     
  3.  Locate and select the Identify messages to send to Exclaimer Cloud rule from the Rules list.
     
  4. Select the transport rule, then select Delete from the Rules menu bar.


     
  5. In the confirmation pane, select Confirm to permanently delete the Transport Rule.
     
  6. Repeat Steps 3 to 5 for the Prevent Out of Office messages being sent to Exclaimer Cloud rule. 
Step 2: Delete the Microsoft 365 connectors
WARNING! This cannot be undone. Deleting the connectors is permanent.

To permanently delete both Microsoft 365 connectors:

  1. From the navigation menu, select Connectors.
     
  2. Select the Receive connector. 
     
  3. In the details pane, select the bin icon.


     
  4. In the confirmation pane, select Confirm to permanently delete the connector.
     
  5. Repeat the process for the Send connector.

Once the transport rule and connectors are removed, your emails will no longer be routed to Exclaimer and signatures will not be added to any emails.

Step 3: Delete the Exclaimer Azure App (post-cancellation only)
WARNING! If you have not cancelled your subscription, do not remove the Exclaimer app(s). 
  1. Log into portal.azure.com using Global Administrator credentials. 
     
  2. From the navigation menu, expand Entra ID and select Enterprise apps. 
     
  3. In the search bar, enter Exclaimer to bring up all Exclaimer apps.
     
  4. Select the Exclaimer Cloud [your region] Setup - Please remove after setup app. 
     
  5. In the menu pane for the selected app, select Manage, then select Properties. 
     
  6. In the Properties pane, select Delete, then select Yes to confirm. 
     
  7. Repeat Steps 4-6 for the Exclaimer Cloud Signatures for Office 365 Sent Items [your region] app. 
Step 4: Remove Exclaimer Domain (post cancellation only)

To remove the domain:

  1. In the Microsoft 365 Admin Center, select Settings from the navigation menu, then select Domains.
     
  2. On the Domains page, select the required domain. This will be in the following form: <unique tenant ID>.smtp.exclaimer.cloud or <unique tenant ID>.excl.cloud.
     
  3. Select Remove Domain.
     
  4. Follow any additional prompts, then select Close.