How are unsubscribes handled?
A. If you send an email message to an address on your account’s Unsubscribe list, the email message will not be sent and instead an error notification containing the following text will be sent back to the From Address on the email message: Web Service Exception UnsubscribedEmailAddressException: Email address is on account’s Unsubscribe list. System.Exception: Namespace.UnsubscribedEmailAddressException: Web Service Exception UnsubscribedEmailAddressException: Email address is on account’s Unsubscribe list. You have the option to have the SMTP relay bypass your account’s unsubscribe list and not perform this check. To do so, check the appropriate box under My Options and Settings –> SMTP Relay.