+.BR "\-M, \-\-mua" =MUA
+"mail user agent":
+Turn on special treatment for some mail user agents. (Right now only
+.BR mutt (1)
+is supported, but more might be added in future.)
+.IR Caveat :
+If your MUA is supported by this feature you must ensure t-prot makes
+use of it when called from within your MUA to work as desired.
+.TP