On Sun, Mar 28, 2010 at 12:26:22AM -0400, Celejar wrote: aptitude remove exim4 && aptitude install postfix should do it (if you want to install postfix). One MTA conflicts with the other and removes its packages. You may, exceptionally, need to dpkg --purge the exim4 components and there's no guarantee that there wont be something hard coded to expect exim _somewhere_ but the above has worked for me. All best,