7bit 8bit alternative 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-description content-disposition content-length content-transfer-encoding 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 mail-reply-to message message-id mime-version model multipart multipart/mixed nametemplate needsterminal news newsgroups octet-stream organization pgp pgp-encrypted pgp-keys pgp-signed pkcs7-mime plain postscript print quoted-printable received references 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 xref x-status x-uuencode