Re: [exim] RBL DNS timeout delays

Karl Schmidt wrote:
> I removed a dead RBL from our system. Now I am getting a lot more spam.
> I think the spam bots give up if they don't get a fast response - is there a better way to
> put a delay back in the system? Or is this just a coincidence and there is a jump in spam
> traffic today?

I've noticed on my server that some delay stops tons of attempts I've had at
sending mail to non-existant users (without beeing logged in the rejection
log which is why I did this).

You could place a 5-10 second delay on connect, a 5-10 second delay on
EHLO/HELO (be sure that the combined isn't over 15 seconds), put a 30-60
second delay on MAIL if the sender is not <> (this is where the spambots
I've noticed drop the connection). If you want, you can also put another
30-60 second delay on the FIRST RCPT command if the sender is not <> (but
not the rest) and 30-60 second delay at DATA time.

The reason for the lower delay at connect and HELO time is so that callouts
will work to you. Exim's default timeout is 30 seconds.

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