Email signatures are defined in the User Profile preferences for each Method User.
If the email doesn't show, the email template may not be set up to show the email signature. Most stock email templates will be set up by default, but custom email templates may not have included it.
This article will cover how to add the merge field to add an email signature to a custom email template.
NOTE: Email signatures are restricted to only 1000 characters.
Updating An Email Template
Select Edit Templates on the Send Email App.
From the list of email templates, select an email template to update.
Within the body of the email template, add this merge field exactly as written:
Users.EmailSignature
The below image has an example of the signature in the Overdue Balance Reminder template:
Save this email template, and you're done.
NOTE: If you just want to add the email signature to one email, and not for all future emails that use the email template, add the same merge field to the bottom of your email:
Users.EmailSignature