On 6/22/2011 3:06 PM, Bryan Rawlins wrote:
Hello List,
I have been working with the coordinators for the Virus Bulletin
Spam test on an issue where our servers were returning "421 Unexpected
failure, please try later" in response to some messages relayed to us
through the competition server.
It took some time to establish what the issue was because the only
trace of the messages in the Exim logs were one line like the following.
+++ 1QZOwg-0002iz-Ix has not completed +++
2011-06-22 11:02:24 [10477] 1QZOwg-0002iz-Ix string_sprintf expansion
was longer than 32768
We finally determined that all the failed emails had one thing in
common, their From: header was 1000's of characters long. Every
example that we examined was obvious spam, so not accepting the
messages isn't really a problem, especially in production
environments. However, it would be nice if this type of error was
handled better. Attached is an example email that caused this error
on our system.
Exim version 4.76
CentOS 4.7 (x64)
log_selector = -retry_defer -queue_run -host_lookup_failed +pid
+queue_time_overall +subject +incoming_interface
Apparently I neglected to mention above that the failure was in the
DATA ACL when 'verify=header_sender' was invoked.
Pardon my omission.
--
Sincerely,
Bryan Rawlins
Systems Administrator
OnlyMyEmail, Inc. <http://www.onlymyemail.com>
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