This is my mailer by choice. I love it.
There is one problem - most pre-compiled TCL/TK packages have the security option compiled in. The following script .xserverrc.secure which came with SuSE solves this.
#!/bin/sh
#
# move this file to ~/.xserverrc, if you don't want to allow everybody to
# get access to your X-Server
#
if [ -x /usr/bin/keygen ]; then
if [ ! -x /usr/bin/hostname -a ! -x /bin/hostname \
-a ! -x /usr/bsd/hostname ];
then
echo "startx: can't get my hostname - exiting"
exit 1
else
host=`hostname`
fi
xauth add $host:0 . `/usr/bin/keygen`
sleep 2
xauth add $host/"unix":0 . `/usr/bin/keygen`
exec X :0 -auth .Xauthority $*
else
exec X :0 $*
fi