The Mailify signature automatically appears at the bottom of the content of your messages when you are in the test version.
When you order a credit pack or subscribe a monthly subscription, it disappears.
Here's what the test signature looks like:
Once you become a Mailify customer, the signature is disabled by default and will no longer be visible in your emails.
However, if you wish, you have the option to activate this signature in the settings of your account, in the "Email campaign" and then in the "Settings" menu.