[Bug 1407098] [NEW] When munging From and Reply-To, add original authoer To Cc instead of Reply-To

[Ralf Jung]

Public bug reported:

Steps to reproduce:
* Configure a list to munge both From and Reply-To (from_is_list and reply_to_list)

Actual behavior:
The emails will have a Reply-To field with both the list address and the author address. As a result, hitting "Reply" in a MUA (tested with Thunderbird) results in both of these addresses as recipients.

Expected behavior:
The mail should be set up in a way that the MUA behavior is like it would be without From munging: "Reply" has only the author as recipient, while "Reply All" has both the author and the list as recipient.

This can be achieved by adding the author to Cc instead of Reply-To in
case reply_to_list is not 0. I attached a patch implementing this, that
I tested successfully on my mailman installations.

This patch is against the CookHeaders.py of Mailman 2.1.18.

** Affects: mailman
     Importance: Undecided
         Status: New

** Attachment added: "mailman-headers.diff"
   https://bugs.launchpad.net/bugs/1407098/+attachment/4291274/+files/mailman-headers.diff

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Title:
  When munging From and Reply-To, add original authoer To Cc instead of
  Reply-To

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