+.SS
+Message Rewrite
+The
+.IR mhfixmsg (1)
+command can apply various transformations to MIME messages, including
+decoding of text parts, converting the character set of text parts,
+and insertion of text/plain parts to correspond to text parts of other
+subtypes.
+.B mhfixmsg
+can also repair defects in MIME messages, such as mismatched top-level
+boundary indicators and invalid Content-Transfer-Encoding values.