The '-r' parameter with msgid can be used to generate in-reply-to
and reference headers to an earlier mail.
+ Note: be careful when using this command. It easily sends out several
+ mails. You might want to run
+
+ git config sendemail.confirm always
+
+ to let `git send-email` ask for confirmation before sending any mail.
+
TODO: 'tg mail patchfile' to mail an already exported patch
TODO: mailing patch series
TODO: specifying additional options and addresses on command