trac emails set reply-to to tor-assistants, which is an obsolete list
When trac sends an email, it sets the header
Reply-To: no-reply@tpo, tor-assistants@tpo(modified to avoid leaving more spam bait for the world)
The tor-assistants list is no longer in use. Anybody who replies to these emails will not be doing a productive act.
I found the line in /srv/trac.torproject.org/trac/tor/conf/trac.ini called smtp_replyto, and I can edit it and restart trac.
But, is this file in puppet or git or something? I see both a .git directory and an RCS directory.
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