Fair enough, and I see you've marked your thread as solved. I did see (and read) this -- one of the first google results for "comparison of mtas":
Thoughtful, subjective analysis, if you're interested.
I think Postfix is a solid MTA, but I have to stick with what I said earlier. If you're already comfortable with Sendmail, I don't understand why you would switch to a new MTA for a (presumably) production project.