I only have a team email setup, but the signature and unsubscribe link do not show up anywhere in the conversations inbox and are not in sent messages. They do, however, appear if I send an email directly from a contact card.
I wanted to refer you to this help article that explains how to set up the team email signature for your team inbox. Once it's set up, this signature applies to emails sent directly from the conversations inbox.
An individual user's signature has a separate setup (more on that here) and will be applied by default when a user send emails from a record in the CRM.
I hope this helps!
Best,
Kristen
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