Re: [Exim] offers123.net & possible DOS.

Top Page
Delete this message
Reply to this message
Author: Philip Hazel
Date:  
To: Dave Restall
CC: exim-users
Subject: Re: [Exim] offers123.net & possible DOS.
On Fri, 17 May 2002, Dave Restall wrote:

> The mail that it has problems with is a spam from offers123.net who
> seem to have an awful lot of MX's - none of which work. I think exim
> patiently but methodically sets out to verify the address from all of
> them until one of them will answer, however because none of them work,
> exim waits for each one to timeout and the remote mailer at demon gets
> bored and terminates the connection.


Exim is only going to do this if you have configured callbacks. In Exim
3, use sender_verify_callback_timeout to reduce the timeouts.

--
Philip Hazel            University of Cambridge Computing Service,
ph10@???      Cambridge, England. Phone: +44 1223 334714.