Say you handle support emails privately at
Ideally this email is distributed amongst at least two employees in different timezones: Tom & John.
Q: How does Tom answer a support email and let John knows he's answered it? A: Use BCC
Q: How do you make sure the inquirer keeps to the firstname.lastname@example.org thread/conversation and not the personal email address of Tom?
A: Use Reply-To:
In mutt, you can automate this process like so:
set include reply-hook . unmy_hdr Reply-To: reply-hook "~C email@example.com" 'my_hdr Reply-To: firstname.lastname@example.org' reply-hook "~C email@example.com" 'push <edit-bcc>,firstname.lastname@example.org<enter>' set edit_headers
Many thanks to scandal on #mutt on irc.freenode.net for
~/.muttc configuration lines.
In Gmail, you can setup the Reply-To: rule, but only for the entire @example.com account which is awkward. Also you must remember to set the BCC: manually.
Now with some luck, you can handle support/issue requests or "bug reports" as conversations in your inbox. This is far from perfect as your supportee may have a crappy MUA and break the thread.
You also would have to manually archive threads to mark them as done. And then you would only know it's "done", as there is no way of telling John is has been archived accordingly without sharing a mailbox. Sharing a mailbox AFAIK is pretty darn hard, though I've heard a rumour of IMAP having such a feature. And you would probably lose some accountability benefit sharing a mailbox.
Futhermore an interim mail BTS hybrid could be better achieved with labels/folders to emulate something like Debian's tags.