apparently-from
apparently-to
application
+application/pgp-encrypted
+application/pgp-signature
+application/pkcs7-signature
+application/postscript
+application/x-pkcs7-signature
audio
base64
bcc
binary
+body
cc
compose
composetyped
content-type
copiousoutput
date
+delivered-to
+delivery-status
digest
edit
+encrypted
+enriched
+enveloped-data
expires
external-body
followup-to
from
+html
image
in-reply-to
iso-2022-jp
+keys-only
lines
list-post
mail-followup-to
message
message-id
mime-version
+mixed
model
multipart
+multipart/mixed
nametemplate
needsterminal
news
newsgroups
+octet-stream
organization
+pgp
+pgp-encrypted
+pgp-keys
+pgp-signature
+pgp-signed
+pkcs7-mime
+pkcs7-signature
+plain
+postscript
print
quoted-printable
received
reply-to
return-path
rfc822
+rfc822-headers
sender
+sign
+signclear
+signed
+signed-data
status
subject
supercedes
supersedes
test
text
+text/plain
to
unknown
us-ascii
utf-8
video
-x-comment-to
x-convert
x-label
+x-mutt-deleted
+x-pgp-message
+x-pkcs7-mime
+x-pkcs7-signature
xref
x-status
x-uuencode