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>
