Virtual Users And Domains With Postfix, Courier, MySQL And SquirrelMail (Ubuntu 9.10)
 

Hello there.

In this tutorial we are "patching" the postfix source and recompiling for quota patch to work.

After this installation, is it possible to upgrade postfix by going trough an "apt-get upgrade" or should I avoid that?

You should avoid that. You can do that with apt-pinning: http://www.howtoforge.com/a-short-in...to-apt-pinning