Comment 3 for bug 558290

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Of course, this behaviour will fail in some cases, but at least in my environment such problems are rare and easily solvable. The user will quickly realize that something is wrong, ask the more experienced users what is going on, and be told how to resolve their problem. Removing their Reply-To header is easy, and it is a one-time operation. It also works in all MUAs.

Also, having to repost the message because you replied to an erroneously set Reply-To header is a minor annoyance for a single person (the poster), who has to repost the message to the list. In the opposite case, with unconditional Reply-To header munging, every misdirected post is an annoyance to the entire list. It also happens every time someone requests off-list replies, instead of just a single time before the user removes his explicit Reply-To header.

If one is concerned about such clients one could for instance start with setting first_strip_reply_to to off, and then enable reply_to_only_set_if_empty after some period of time. During the transitional period the users with malconfigured clients will quickly ask why they suddenly receive two copies of all replies. They will then be told to remove their Reply-To header from their client, and will probably do so. This is a minor annoyance to a single person, the one with a malconfigured client.

Believe me, there is nothing I'd rather do than disable the munging completely. However, this would not solve anything, only cause even more e-mails to be sent in the wrong direction. Therefore I'd like a milder form of munging, which doesn't discriminate users who know what they're doing.