https://bugs.exim.org/show_bug.cgi?id=1684
--- Comment #6 from Jeremy Harris <jgh146exb@???> ---
$max_received_linelength is already populated with the relevant value.
This can be checked in the smtp_data acl and the smtp transports:
acl_check_data:
deny condition = ${if > {$max_received_linelength}{998}}
...
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.
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