[Bug 1304511] [NEW] The from_is_list feature does not identify the poster in From: if the proser's From: has no display name.

[Mark Sapiro]

Public bug reported:

The from_is_list feature creates a new From: header of the form

From: realname via lists_real_name <list_posting_address>

where realname is the display name from the posters From:. If the
poster's From: has no display name, this string is null. It should
contain at least the local part of the poster's From: address in this
case.

It probably should not contain the domain part because this will result
in

From: "user at example.com via The_list" <the_list at example.net>

and the presence of two different domain names in the From: header, even
if one is in the display name, is said to be an indication of spaminess,
so we should make this

From: "user--- via The_list" <the_list at example.net>

** Affects: mailman
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1304511

Title:
  The from_is_list feature does not identify the poster in From: if the
  proser's From: has no display name.

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