This has nothing to do with authenticating - it only has to do with
verifying addresses.
Add receiver_verify = true to your global config, and your mailserver
should then response to any invalid RCPT TO:'s with a 5xx code..
On Tue, 13 Nov 2001, Martin Cameron wrote:
> Thanks to all who have replied to this posting. I'm using MySQL to authenticate email addresses and have
> placed ":fail:" in the aliases field. It's working as expected except that out server is still actioning the
> receipt as follows:
>
>
> 2001-11-13 10:31:15 163Ofi-0005BJ-00 <= Johanna.Metcalfe@??? H=mail.hvp.ac.nz
> (smtpmm1.hvp.ac.nz) [203.96.144.31] P=esmtp S=35109 id=sbf0f45e.049@???
> 2001-11-13 10:31:15 163Ofi-0005BJ-00 ** jobob@other_isp.co.nz: forced failure:
> 2001-11-13 10:31:15 163Ofj-0005C5-00 <= <> R=163Ofi-0005BJ-00 U=root P=local S=35936
> 2001-11-13 10:31:15 163Ofi-0005BJ-00 Error message sent to Johanna.Metcalfe@???
> 2001-11-13 10:31:15 163Ofi-0005BJ-00 Completed
>
> >From this you will see that our MTA is still having to handle the email and send a response to the sender.
> Is there not some way to even circumvent this so that the mail is not even processed by our MTA.
>
> Regards
> Martin
>
> PS I take on board the obligation to respond to malformed email addresses, but the additional load that we're
> put under is unacceptable.
>
>
> Nigel Metheringham wrote:
>
> > On Tue, 2001-11-13 at 03:19, Martin Cameron wrote:
> > > We host a domain that is very similar to another ISP's domain. As a
> > > result, we get a lot of email coming to us bound for them which we
> > > simply want to pipe to /dev/null.
> >
> > As an addition to Matthew Byng-Maddick's message, the most efficient
> > thing for you to do is to bounce unwanted messages at SMTP time - then
> > they don't even cross your network into your mailhost for it to then
> > throw away.
> >
> > To do this you need set some of the receiver_verify options (there are a
> > group of them), and make sure the directors which handle that domain
> > also handle verification. Then a
> > :fail:You probably meant to send to zz.dom.ain instead
> >
> > entry in an alias file will bounce the message during the SMTP
> > transaction - handing off 90% of the real work involved to the sending
> > MTA rather than your box.
> >
> > Nigel.
> > --
> > [ Nigel Metheringham Nigel.Metheringham@??? ]
> > [ Phone: +44 1423 850000 Fax +44 1423 858866 ]
> > [ - Comments in this message are my own and not ITO opinion/policy - ]
> >
> > --
> >
> > ## List details at http://www.exim.org/mailman/listinfo/exim-users Exim details at http://www.exim.org/ ##
>
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