I noticed when CentOS 6 came out that RHEL had moved to postfix vice sendmail as the default MTA. I had never heard the rationale given, it always sat on the back burner, but I was reminded of the question the other day when I was dealing with a related topic. I don't want to get into a pissing contest about how one MTA is obviously better than the other, nor why others think that I should prefer one over the other, but I *would* like to know what rational (if any) RedHat gave on the move. My google-fu hasn't been successful in finding it and I didn't see anything in the CentOS archives on the topic. Does anyone remember the reasoning, if given? In particular, I'm wondering if it was due to integration with any other specific subsystem or software product. Devin