How to apply a personal signature to an email sent from a shared mailbox

Scenario

You send emails from a shared mailbox and would like your own personal signature to be applied to the email message.

Resolution

There are two different methods for applying personal signatures to emails sent from shared mailboxes:

Using client-side:

The easiest way to apply your personal signature would be to apply a client-side signature to the message in Outlook. For more information, see how you can apply a client-side signature.

Using server-side:

When a signature is applied using a server-side signature rule, the signature that is applied to the message will depend on the permissions that have been configured for the mailbox in Exchange Online:

• If the delegate has send-as permission, the shared mailbox's signature will be applied.
• If the delegate has send-on-behalf permission, the signature applied will depend on the setting configured for Send on Behalf.