Hi Ricardo,
Thanks for the bug report! It's very strange, but I'm not able to reproduce this. I tried the following. bug_49114.mbox is downloaded from https://debbugs.gnu.org/cgi/bugreport.cgi?mbox=yes;bug=49114 --8<---------------cut here---------------start------------->8--- (use-modules (email email)) (pk (parse-email-headers "Subject: bug#49114: =?UTF-8?Q?=E2=80=98guix_?= =?UTF-8?Q?lint=E2=80=99?= should catch certificate validation exceptions ")) (for-each (lambda (bv) (pk (assoc-ref (email-headers (parse-email bv)) 'subject))) (call-with-input-file "bug_49114.mbox" mbox->emails)) --8<---------------cut here---------------end--------------->8--- Even at https://issues.guix.gnu.org/49114 , only the "bug title" has the spurious underscore. The subject of the first message does not. Is the bug title something stored in the xapian index? Could it be that this was an older bug that has corrupted the xapian index? If I understand correctly, mumi does not rebuild its xapian index. I think it should do so from time to time. It would help prevent old bugs from getting persisted in storage. Cheers, and wish you a Happy New Year! :-) Arun
