[Gllug] Rejecting mail at backup MX

Jason Clifford jason at ukpost.com
Wed Feb 11 15:48:06 UTC 2004

On Wed, 11 Feb 2004, Xander D Harkness wrote:

> (For those that have not used it: Exim tries to reject the email and
> sends a test reject to the sender.  Most spammers falsify sender
> addresses or use non-existant accounts and hence will either fail
> because the account does not exist or because the poor user who has been
> abused has a full mailbox.
> I use it for earthlink, .ru, .cn hotmail and a few others)

For those running postfix this kind of callout is available in the 2.0.x 
(where x > 10) releases and is easy to implement.

Do note however that this will block legitimate email as well - plenty of 
people use munged email addresses.

Remember that callout can only use the MAIL FROM address as provided 
during the SMTP conversation for this.

Jason Clifford
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http://www.ukfsn.org/	   ADSL Broadband from just £23.75 / month 

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