debbugs.gnu.org is GNU's debbugs instance
I often use "bts --bts-server debbugs.gnu.org",
but there is no equivalent for reportbug.
It appears to require appending to SYSTEMS in debbugs.py.
I'm not sure this would actually be useful --- for reporting upstream
bugs in GNU Emacs, I mostly use "emacs -f report-emacs-bug".
The issue arose this morning because someone had already done that,
and wanted to add a follow-up "it's fixed now" comment,
but didn't know how to reply from mutt using "bts ... show -m 123".
He ended up just starting a new thread by emailing email@example.com directly,
but it would've been fun to try reportbug -N first. :-)
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