How to add signatures to only external or internal emails?
You can use one of the below methods to enable signatures to only external or internal emails.
Method 1: Enable email signatures for all users/groups
This option lets you apply signatures to every user in your Microsoft 365 tenant.
Click here to know the Exchange Online Signature configuration steps:
Method 2: Add signatures to External emails only:
Check the ‘External recipients’ in the ‘Recipients’ tab under ‘Signature Rules’.
Method 3: Add signatures to Internal emails only:
Check the ‘Internal recipients’ in the ‘Recipients’ tab under ‘Signature Rules’.
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