> #+options: title:nil
Thanks a lot! This worked, but still problematic. If I have "#+options:
title:centered" for letter 1 but "#+options: title:nil" for letter 2, letter 2's
setting will override letter 1's. I.e., letter 1 will have no title now.
Also, I was looking into ox-koma-letter.el trying to find some clue, but I
couldn't find where it handles the "title" option. The closest I've got was
`org-koma-letter-subject-format', which can be set with "#+OPTIONS subject". But
it seems that the "subject" option works the same as the "title" option, and has
exactly the same problem.
Thanks