On Mon, 30 Apr 2007, Guy Fraser wrote:
On Fri, 2007-04-27 at 22:04 -0400, Tony Nelson wrote:
I will look into greylisting and see what I can come up with.
Greylisting is one of the biggest winners here. We've cut the spam load
so much that spam assassin now catches almost nothing.
Also look at Early Talker, called Greet Pause in sendmail. It's when the
sender has sent the whole message at once, rather than having a proper SMTP
conversation. Such messages can be presumed spam, and discarded with no
further action.
Hmm... That looks like a reasonable idea.
The general consensus on the postfix mailing idea is that Greet Pause is a
bad idea (TM). What it ends up doing is (a) delay legitimate mail and (b)
DoS your own server as you now take longer to handle legitimate mail. Any
mail source that would fail greet pause will also fail numerous other
checks that don't inconvenience your intended users (and your own system).
Steve Friedman
