[exim] Switch MTA problem

Hi


I Install exim 4.70 and start exim service. but "alternatives --config mta"
return only this"

++++++++++++++++++++++++++++++++++++++
 Selection    Command
-----------------------------------------------
*+ 1           /usr/sbin/sendmail.sendmail
++++++++++++++++++++++++++++++++++++++

In "/usr/sbin" i check exim:

++++++++++++++++++++++++++++++++++++++
# ls -l exim
# lrwxrwxrwx 1 root root 25 Nov 18 18:31 exim -> /usr/exim/bin/exim-4.70-1
++++++++++++++++++++++++++++++++++++++

how can i switch to exim MTA?

--
M Alavizadeh