-The first part of the MIME message is the draft body if that body contains
-any non-blank characters.
-The body of each header field whose name matches the
-.I header-field-name
-is interpreted as a file name, and each file named is included as a separate
-part in the MIME message.
-.PP
-For file names with dot suffixes, the context is scanned for a
-.I mhshow-suffix-
-entry for that suffix.
-The content-type for the part is taken from that context entry if a match is
-found.
-If no match is found or the file does not have a dot suffix, the content-type
-is text/plain if the file contains only ASCII characters or application/octet-stream
-if it contains characters outside of the ASCII range.
+The first part of the MIME message is the draft body if the body is non-empty.
+The body of each attachment header field is interpreted as a file name,
+and each file named is included as a separate part in the MIME message.