application/pgp-encrypted
application/pgp-signature
application/pkcs7-signature
+application/postscript
application/x-pkcs7-signature
audio
base64
content-type
copiousoutput
date
+delivered-to
delivery-status
digest
edit
external-body
followup-to
from
+html
image
in-reply-to
iso-2022-jp
octet-stream
organization
pgp
-pgp-encrypt
+pgp-encrypted
pgp-keys
pgp-signed
pkcs7-mime
plain
+postscript
print
quoted-printable
received
supersedes
test
text
+text/plain
to
unknown
us-ascii
x-comment-to
x-convert
x-label
+x-mutt-deleted
x-pgp-message
x-pkcs7-mime
xref