Scripting changing sending MTA

[Robert Moskowitz]

This is on a Fedora system.

In the Postfix install documentation I found that I need to do the 
following:

/usr/sbin/alternatives --config mta

And select '2' to switch to Postfix.

Is there a way to put this into an install script?

Something simple like:

echo 2| /usr/sbin/alternatives --config mta

???