rt 4.4.4 here
I don’t see any docs about what should be in $Organization setting in config. So I had it set to “My_Org_c.o.” (note the dot at the end).
rt uses this $Organization in raw form in Message-Id headers. These headers have strict rules:
which do not allow dot at the end for example. rt doesn’t do any normalization of $Organization before using it in Message-Id. That broke logging and handling of message id in my MTA (exim in my case and yes, exim does Message-Id validation).
Please consider this to be a bug report. rt should do normalization or just add “[” “]” (and strip “]” and ""), so message-id would be:
Message-Id: [$Organization]
as allowed by rfc 5322:
msg-id = [CFWS] “<” id-left “@” id-right “>” [CFWS]
id-left = dot-atom-text / obs-id-left
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 ""
btw. Workaround like changing $Organization is not a option here because it breaks all references between tickets.