The link must appear within the email, regardless of whether it is presented in the header or at the very end.
The link text must be clear and unambiguous.
The link color must not obscure the link within the email.
The font size of the link must be sufficiently large and proportional to the rest of the text.
Unsubscription must be free and unconditional.
Good to know: the unsubscribe link is not mandatory for transactional emails that directly contribute to the proper functioning of the expected service (order confirmation, shipping notice, payment method expiration, etc.).
After typing the text that will serve as the unsubscribe link, select that same text.
Click on the chain, which will allow you to identify the text as being a link.
In the "Type" dropdown list, select "To an unsubscribe form".
In the "Method" dropdown list, choose the location of the page that will allow your recipient to unsubscribe independently.