Well, I checked over my muttrc file. I'm beginning to think that 1 or more of the commands that I have in there could be the cause of my problem. Here are the relevant parts of my muttrc: set pgp_sign_command="/usr/bin/gpg --no-verbose --batch --quiet --output - \ --passphrase-fd 0 --armor --detach-sign --textmode %?a?-u %a? %f" set pgp_clearsign_command="/usr/bin/gpg --no-verbose --batch --quiet --output - --passphrase-fd 0 --armor --textmode --clearsign %?a?-u %a? %f" I also have pgp_autosign, pgp_verify_sig, and pgp_timeout to 3600. Anyone know anything in the above set of commands that could possibly contribute to the signatures not being in the traditional form? Thanks! P.S: I do have pgp_create_traditional set to yes.