What is an unsubscribe footer?
An unsubscribe footer is the block at the end of a marketing email that says who sent it, where the sender is, and how to stop further messages. CAN-SPAM in the United States asks for a postal address and a clear opt-out; EU rules ask for the sender to be identifiable and for a simple, free way to object.
Reading the result
The generator writes the footer as HTML, with its styles written inline on each element, and as plain text for the text part of the message. A preview shows it as it will read. Under it, the rules are summarised as the FTC, the EU texts, the CNIL and Gmail state them, each with its source, so you can check the wording yourself.
What footers usually get wrong
An opt-out that does not record anything
A link to a page that only says "you are unsubscribed" removes no one. Whatever sits behind the link or the address has to add the person to your suppression list, and CAN-SPAM gives 10 business days to honour it.
Asking for more than an email address
The FTC says you cannot charge a fee, ask for personal information beyond an email address, or require any step other than a reply email or a visit to a single web page.
Relying on the footer for Gmail
Gmail's one-click unsubscribe, required of senders of 5,000 or more messages a day to Gmail accounts, works through the List-Unsubscribe headers. Those are set by your sending tool. The footer link is required as well, and does not replace them.
No address, or one that is not yours
CAN-SPAM requires a valid physical postal address: a street address, a registered post office box or a registered private mailbox. A website address is not one.