+ignore_unknown
in your list?
Jethro.
On Fri, 16 Aug 2013, Paul Walsh wrote:
>
> I've been bitten by this a number of times and wondered if anyone had
> a) done the same, and b) come up with a solution....
> In the configuration file of our outbound mail gateway I have a host
> list relay_hosts of all hosts allowed to relay mail. In the ACL for
> acl_smtp_rcpt I have the following:
> accept hosts = +relay_hosts
> #
> # If we've got this far it means the source and recipient are outside
> our control
> # and thus someone is trying to use us as a relay.
> #
> deny message = relay not permitted
> This is all fine and dandy until the entry for one of the hosts in
> relay_hosts is deleted from DNS. As Exim works its way through the
> list to verify if a sending host is allowed to relay mail, it hits the
> entry for the now defunct host, tries a forward DNS lookup to get an
> IP address to compare with that of the sending host and, because the
> lookup fails, immediately considers the sending host to not be in the
> list thus causing delivery to fail with the "relay not permitted"
> message. Unfortunately, any attempt to relay mail by a host in the
> list after the defunct host also results in a "relay not permitted"
> rejection.
> I'm trying to determine if it's possible to have Exim parse the entire
> list, only rejecting if the sending IP address didn't match any of
> those returned by looking up each host, or at the very least flag up
> some sort of warning that the host list contains addresses that can't
> be resolved.
> Thoughts?
> --
> Paul Walsh
>
> Head of Unix/Linux Systems Services,
> Corporate ICT,
> Birmingham City University,
> City North Campus, Perry Barr,
> BIRMINGHAM B42 2SU, UK
> Tel: +44 (0)121 331 5708
> Fax: +44 (0)121 356 2875
> Mobile: +44 (0)7974 150 421
> --
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>
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Jethro R Binks, Network Manager,
Information Services Directorate, University Of Strathclyde, Glasgow, UK
The University of Strathclyde is a charitable body, registered in
Scotland, number SC015263.
