Today we've updated email footers.
Changes were made especially in email templates.
If you want your emails to be sent with a footer, first check if you have {{footer}} variable in your template.
All you have to do is to edit your template, and next, in Email settings just set the footer.
You can find instructions in this article: Email footer.
Learn more about email templates here: Email templates.
Remember that such changes can be set by account's administrators only.