It wasn't clear to me exactly what this does -- in particular, what
happens if it isn't specified? Does it support multiple values? A
very brief explanation can answer both of these questions without
making somebody look at the code.
[publicinbox "test"]
watchheader = List-Id:<test.example.com>
+If specified, L<public-inbox-watch(1)> will only process mail matching
+the given header. Multiple values are not currently supported.
+
Default: none; only for L<public-inbox-watch(1)> users
=item publicinbox.<name>.nntpmirror
mainrepo = /path/to/test.example.com.git
; config keys specific to public-inbox-watch:
+
watch = maildir:/path/to/maildirs/.INBOX.test/
+
+ ; optional, emails that don't have a header matching
+ ; value will be skipped
watchheader = List-Id:<test.example.com>
[publicinboxwatch]