Mailing List Archive

https://bugs.exim.org/show_bug.cgi?id=2805

Bug ID: 2805
Summary: valid message-id with [] on right side considered
invalid
Product: Exim
Version: N/A
Hardware: x86
OS: All
Status: NEW
Severity: bug
Priority: medium
Component: Unfiled
Assignee: unallocated@exim.org
Reporter: arekm@maven.pl
CC: exim-dev@exim.org

exim 4.92.4 doesn't consider 1234@[bar.] to be valid message-id

$ echo -e 'From: root\nMessage-ID: 1234@[bar.]\n\nhi\n' | exim -v root 2>&1 |
grep "<="
<= arekm@example.org U=arekm P=local S=359

it isn't logged here as id=XYZ (while for example using "1234@bar" is logged
fine)

while https://datatracker.ietf.org/doc/html/rfc5322#section-3.6.4 allows such
message-id

msg-id = [CFWS] “<” id-left “@” id-right “>” [CFWS]
id-right = dot-atom-text / no-fold-literal / obs-id-right
no-fold-literal = “[” *dtext “]”

dtext = %d33-90 / ; Printable US-ASCII
%d94-126 / ; characters not including
obs-dtext ; “[”, “]”, or “”



ps.
That also means that there is some kind of message-id validation in exim which
is interesting since there is request to add such validation (in a different
area) https://bugs.exim.org/show_bug.cgi?id=330

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