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http://bugs.exim.org/show_bug.cgi?id=1328
Summary: log actual failing lookup for temporary DNS problems
Product: Exim
Version: 4.77
Platform: Other
OS/Version: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Logging
AssignedTo: nigel@???
ReportedBy: eximusers@???
CC: exim-dev@???
Forwarded from <
http://bugs.debian.org/670035> where Ian Jackson wrote:
My config contains (reformatted for readability):
hostlist relay_hosts = +ignore_unknown : \
chiark.greenend.org.uk : localhost : permutation-city.greenend.org.uk : \
10.0.0.0/8 : 172.16.0.0/12 : 192.168.0.0/16 : \
[ a list of hostnames for which I will relay ]
and
begin acl
check_recipient:
[...]
accept hosts = +relay_hosts
deny message = relay not permitted
Currently, one of those hostnames is not resolveable - it gives a
temporary DNS lookup error. When another host, later in the list,
tries to relay, Exim concludes (arguably correctly[1]) that the acl
should return "defer"; as a result the RCPT message must get a
temporary failure response.
However, the actual cause of the deferral is neither logged nor told
to the caller. The mainlog and rejectlog get:
2012-04-22 13:25:59 H=(liberator.relativity.greenend.org.uk)
[172.18.45.4] U=ian F=<ijackson@???> temporarily
rejected RCPT <******>
and the caller gets:
451 Temporary local problem - please try later
Hosts which are listed in the hostlist but which get NXDOMAIN from
the DNS _are_ logged, eg:
2012-04-22 13:25:59 no IP address found for host
*****.org.uk (during SMTP connection from
(liberator.relativity.greenend.org.uk) [172.18.45.4])
But these are of course not the cause of the deferral. The host whose
DNS was broken, and whose entry in the hostlist is thus causing
everything not to work, is not mentioned. I was able to debug the
problem only by running exim in a debug mode with the debugging
messages turned right up, and inspecting the output closely.
I think this situation warrants a message to the log.
Thanks,
Ian.
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