On 05/08/2013 07:31 PM, Mike Marcott wrote:
The Problem: external senders are getting a delay DSN on their end. Mail
usually comes through to us though, but can take up to 24 hours!
What I've found so far: looks like exim is blocking the emails for certain
senders. Log files from /var/log/exim/reject.log are littered with host lookup
errors as such
(names & ip's changed to protect the innocent)
2013-02-17 08:25:49 H=(owa.mycustomer.com) [XXX.XXX.XXX.XXX] F=<[email protected]>
temporarily rejected RCPT <[email protected]>: host lookup deferred for reverse lookup
check
2013-02-17 08:26:50 H=(owa.mycustomer.com) [XXX.XXX.XXX.XXX] F=<[email protected]>
temporarily rejected RCPT <[email protected]>: host lookup deferred for reverse lookup
check
2013-02-17 08:27:51 H=(owa.mycustomer.com) [XXX.XXX.XXX.XXX] F=<[email protected]>
temporarily rejected RCPT <[email protected]>: host lookup deferred for reverse lookup
check
2013-02-17 08:28:52 H=(owa.mycustomer.com) [XXX.XXX.XXX.XXX] F=<[email protected]>
temporarily rejected RCPT <[email protected]>: host lookup deferred for reverse lookup
check
2013-02-17 08:29:53 H=(owa.mycustomer.com) [XXX.XXX.XXX.XXX] F=<[email protected]>
temporarily rejected RCPT <[email protected]>: host lookup deferred for reverse lookup
check
2013-02-17 08:30:54 H=(owa.mycustomer.com) [XXX.XXX.XXX.XXX] F=<[email protected]>
temporarily rejected RCPT <[email protected]>: host lookup deferred for reverse lookup
check
(Why every minute? even after the message is delivered?)
Not enough info (and your protecting the "innocent" does not help here).
Probably they (the external sender) are retrying every minute.
I've done a reverse dns lookup on the owa.mycustomer.com and found it exists.
I bet it's flakey.
Any help would be appreciated. Thank you!
Somewhere in your rcpt acl there's a verify= reverse_host_lookup line. Find
the right one, and wrap it
so that it doesn't get called for this host.
Or fix your (or their) dns.
--
Cheers,
Jeremy
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