примеры использования
When the recipient tries to unsubscribe , the spammer discovers that the recipient's e-mail address is valid and active.
It's become one of many mailing lists to which I really should unsubscribe , because although I continue to receive the messages, I delete them almost immediately.
A listserve is an electronic mailing list, and you need only an e-mail address to subscribe and may unsubscribe at any time via e-mail.
Spamming is an honorable profession, and all spammers live by the credo that everyone should have the right to unsubscribe from future mailings.
This means these messages must contain a valid return email address and a mechanism for allowing people to unsubscribe (amongst other things).
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