“When the recipient tries to unsubscribe, the spammer discovers that the recipient's e-mail address is valid and active.”

“A simple link in each email allows recipients to unsubscribe from future mailings.”

“This means these messages must contain a valid return email address and a mechanism for allowing people to unsubscribe.”

“It is this address that subscribes, unsubscribes, sends out lists of addresses of the members, and provides other limited functions.”

“Already in the past month I've unsubscribed from both yahoogroups and feeds in an attempt to simplify.”

“I sent a message to the list explaining that I'd unsubscribed, and that I would still try to turn up at the odd events, and maybe reappear on the list at some point later.”

“I have been a Crikey subscriber twice since you began but each time I have unsubscribed because I did not like the gossip and general nastiness in most of your material.”

“Further to that last entry, one of the mailing lists I won't be unsubscribing from is the Daily Philosophical Quotation service provided by TPM Online.”