In order to adhere to CAN-SPAM Act regulations and domain offer recipients the ability to opt out of receiving future emails, what text should I include at the bottom of the email if there's no website where I can add an "Unsubscribe" button?
It is important to note that compliance with the CAN-SPAM Act may require more than just the wording of an unsubscribe message. Here is a possible phrasing you could use:
"We respect your privacy and understand that you may prefer not to receive future emails from us. If you wish to opt out of any future communications, please reply to this email with the subject line 'Unsubscribe,' and we will promptly remove you from our distribution list. Please note that it may take up to [number of days] for your request to be processed. Thank you."
Here is an alternative suggestion for the wording you can use:
"To unsubscribe from future emails, please reply to this email with 'Unsubscribe' in the subject line. We will promptly remove you from our mailing list. Please allow [number of days] for your request to be processed. Thank you for your understanding."