Public bug reported:
Currently, mailman3 automatically moves the "Re:" prefix in the subject
of a post after the mailing list tag. For example, if a user sends a
reply to a post with subject "[tag] Title", his mail client will
typically generate a new subject "Re: [tag] Title", which is then
converted by mailman3 to "[tag] Re: Title" and then sent to the other
recipients of the mailing list.
This behavior creates a problem when recipients create replies to this
reply. Let's consider an example, where a user has configured email
filters that place all posts from a mailing list (ML) to a dedicated
email folder. The user uses a mail client, such as Thunderbird, to send
and receive posts.
Most mail clients only support "Re:" prefix in the beginning of the
subject, and if the prefix is not found there, the mail client will add
a new one. So replying to the message with subject "[tag] Re: Title"
will create a new subject "Re: [tag] Re: Title". Although mailman3 will
remove the leading "Re:" prefix upon receiving the post, the original
post will still be saved with subject "Re: [tag] Re: Title" in the
mailbox of the sender. This is because the mail service (e.g. GMail)
will put the sent message with the duplicate "Re:" prefixes to the ML
folder, according to its filters. This means that the user will see a
mixture of messages in the ML folder - some with duplicate "Re:"
prefixes and some with the mailman3-style prefixes. This inconsistency
makes reading the posts more difficult, especially if the user prefers a
flat list of messages ordered by date instead of threaded view.
This issue asks to make this mailman3 behavior configurable, so that
there is an option to disable it and always maintain "Re:" prefixes in
the beginning of the subject line. I believe, this was possible in some
older mailman versions through the OLD_STYLE_PREFIXING option; this
issue asks to restore that functionality.
I'll add that "Re:" prefix in the beginning of the subject line is the
norm in email correspondence and the vast majority of mailing lists I
participate in. It is also the way how subjects of e.g. GitHub and
GitLab notifications are formatted. This placement allows to avoid the
duplicate "Re:" prefixes.
** Affects: mailman
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2117089
Title:
Add support for the traditional placement of "Re:" in subject
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