May, 2005
Submitted by xqus on Sat, 05/28/2005 - 17:10
Some months ago, a friend was talking about greylisting and how effective it was against spam and e-mail viruses. Today I installed milter-greylisting on two of my mailservers.
And it is quite amasing. The first time a SMTP server tries to deliver a message, the maessage is rejected, real mailservers will resend the message and this time the message is accepted. A mass mailing application or a virus will most likely not handle the error response correctly, and just ignore it.