+.BR Sign-Header :
+Sign
+.RS 5
+The (pseudo) header in draft messages, that requests the message to be
+signed automatically by
+.BR send ,
+using
+.BR mhsign .
+If you like to type a lot, name it `X-MH-Sign-This-Message'.
+(profile, default: `Sign')
+.RE
+.PP
+.BR Enc-Header :
+Enc
+.RS 5
+The (pseudo) header in draft messages, that requests the message to be
+signed and encrypted by
+.BR send ,
+using
+.BR mhsign .
+If you like to type a lot, name it `X-MH-Encrypt-This-Message'.
+(profile, default: `Enc')
+.RE
+.PP
+.BR Mime-Type-Query :
+file \-b \-\-mime
+.RS 5
+A command that prints the MIME type of a file.
+The file name gets appended to the command line.
+Note: Older GNU versions of file(1) won't generate the desired
+output. GNU file-4.26, for instance, omits a required semicolon.
+GNU file-5.04 is known to work. Non-GNU version likely need different
+options or don't provide this function at all. Alternatively, you can use
+.BR print\-mimetype ,
+which is part of mmh, but guesses MIME types by file name extensions only.
+.RE
+.PP