https://bugs.exim.org/show_bug.cgi?id=1684
Andreas Metzler <eximusers@???> changed:
What |Removed |Added
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CC| |eximusers@???
--- Comment #10 from Andreas Metzler <eximusers@???> ---
(In reply to Jeremy Harris from comment #6)
> $max_received_linelength is already populated with the relevant value.
> This can be checked in the smtp_data acl and the smtp transports:
[...]
> remote_smtp:
> driver = smtp
> message_size_limit = ${if > {$max_received_linelength}{998} {1}{0}}
>
> Doing the latter results in a bounce for a long-line message accepted via
> non-smtp and routed to an smtp transport. You could reject in the non-smtp
> acl instead, but if support for long-lines in non-smtp traffic is desired
> this would be complex to properly filter.
>
> Possibly we should add the above to the example configuration file.
The problem with this approach is that bounce message generated when rejecting
SMTP transmission of a pipe injected message ("/usr/sbin/sendmail
somebkdy@??? < longlines.txt") is lacking any information why the
message bounced.
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Reporting-MTA: dns; server.example.com
Action: failed
Final-Recipient: rfc822;recip@???
Status: 5.0.0
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Return-path: <root@???>
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Date: Sat, 31 Dec 2016 18:33:10 +0100
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