Public bug reported:
According to rfc2919 the List-Id field should be formated like this:
list-id-header = "List-ID:" [phrase] "<" list-id ">" CRLF
This works as long as description is left blank or contains supported
characters. In my case the description was as follows:
�ffentliche Supportliste
As you can see the umlaut "Ö" got broken while importing the list from an old
server. Unfortunately I don't know how the import was done. The field is still
present but < and > around the list-id are missing. This is problematic with
procmail and other mail filters.
** Affects: mailman
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1831321
Title:
the List-Id field is filled without < and > around the list-id if the
description contains unsupported characters
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