On Wed, Jun 14, 2006 at 11:36:53AM +1000, Billy Kwong wrote: > That depends on the implementation of the MTA or greylisting. The point of > greylisting is to slow down the spammers as to how quickly (which is what > they rely on) they could spew out spam.
You're thinking of teergrubing (where the SMTP server inserts delays after each of its responses). Greylisting relies on most spamming software being pretty dumb; some only try to send a message once, and don't respect a "mailbox temporarily unavailable" response from the SMTP server. A compliant SMTP client would try to resend a message after a certain delay, when faced with such a response. Cheers, Paul -- Paul Dwerryhouse | PGP Key ID: 0x6B91B584 -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
