small tweaks

neomutt/mailcap

@@ -17,6 +17,9 @@ image/*;                    open -a "Preview" %s;
 text/html;                  open -a "Firefox" %s; nametemplate=%s.html
 text/html;                  w3m -dump %s; copiousoutput; nametemplate=%s.html
 
+# This should work, but doesn't
+#text/plain;                 ~/bin/mutt-unproofpoint.py %s; copiousoutput
+
 text/vcard;                 mutt_vcard_filter; copiousoutput
 
 text/x-diff;                view %s; needsterminal