https://bugs.exim.org/show_bug.cgi?id=2827

            Bug ID: 2827
           Summary: bounce generated by exim gets too long lines breaching
                    message_linelength_limit limit
           Product: Exim
           Version: 4.95
          Hardware: All
                OS: All
            Status: NEW
          Severity: bug
          Priority: medium
         Component: Delivery in general
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]

exim 4.95, noticed frozen message in queue. Attempt to delivery failed:

LOG: MAIN
  ** [email protected] F=<> P=<> R=to_world_bounce T=remote_smtp: message
has lines too long for transport DT=0.000s
>>>>>>>>>>>>>>>> deliveries are done >>>>>>>>>>>>>>>>

but it's a bounce, generated on this system.

# awk ' {print length ":" $0 } ' /var/spool/exim/input/P/1miDrP-0004EL-SU-D |
sed -e 's#here-was-original-16-characters-domain#1234567890123.pl#g' | grep -E
"^[0-9]{3}"
1012:References: <[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<027001d7d09d$bb218ce0$3164a6a0
186:Thread-Index:
AdfMqF9GKg/E6vf/QPm7eEfN6pNZ6gD189cAAAAx0DAAAGB94AAAQSpAAACJESAAAh6qMAAAbl0AAABZ25AAAFSiEAAAVatwAAA8nkAAADlZkAAAHe6QAABpU8AAAB0usAAAiFMAAABPYmAAAE2QkAAAMquAAAA/j+AAAHqgwA==
#

so that line is 1012 bytes long (and the limit is 998).

Something tried to split that header (or it was split in original message)
because last entry is split into one new line, too:

# awk ' {print length ":" $0 } ' /var/spool/exim/input/P/1miDrP-0004EL-SU-D 
...

1012:References: <[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<[email protected]>
<027001d7d09d$bb218ce0$3164a6a0
72:        [email protected]>
<[email protected]>


Also for reference:
https://bugs.exim.org/show_bug.cgi?id=1760

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