[Bug 987563] [NEW] List-Post should be NO when posting is not allowed
Public bug reported:
>From RFC 2369:
The List-Post field describes the method for posting to the list.
This is typically the address of the list, but MAY be a moderator, or
potentially some other form of submission. For the special case of a
list that does not allow posting (e.g., an announcements list), the
List-Post field may contain the special value "NO".
Mailman currently prevents adding the List-Post header for announce-only
lists. Instead it should include it with the value of NO.
** Affects: mailman