-@item subject-cmsg
-Check the subject for commands.
-@item sender
-@cindex Sender
-Insert a new @code{Sender} header if the @code{From} header looks odd.
-@item multiple-headers
-Check for the existence of multiple equal headers.
-@item sendsys
-@cindex sendsys
-Check for the existence of version and sendsys commands.
-@item message-id
-Check whether the @code{Message-ID} looks ok.
-@item from
-Check whether the @code{From} header seems nice.
-@item long-lines
-@cindex long lines
-Check for too long lines.
-@item control-chars
-Check for invalid characters.
-@item size
-Check for excessive size.
-@item new-text
-Check whether there is any new text in the messages.
-@item signature
-Check the length of the signature.