I voted for "other" as I recently switched from Sendmail to OpenSMTPD as well. I probably don't have nearly as much experience with email servers as jggimi, but I can say that 99% of the problems I've seen with email servers is misconfiguration (open relay or the like), so the one your email admin is most comfortable with is probably the best choice =)
OpenSMTPD is pretty hard to beat in that respect.
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Linux/Network-Security Engineer by Profession. OpenBSD user by choice.
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