I've became a big fan of OpenSMTPD lately, although for two specific use cases. I manage a number of mail systems, some small and some large, and used Postfix exclusively.
Recently, after discovering and playing with OpenSMTPD, I've started replacing Postfix with OpenSMTPD on null mailers and internal relays. My Postfix configuration is pretty much identical on all of those hosts and I've gotten it pretty polished over the years, but there's something about the simplicity of OpenSMTPD that I really like.
I don't envision moving from Postfix anytime soon on my main mail systems (which serve many, many domains and users). If I had a much simpler mail setup I would definitely consider it, though.
Recently, after discovering and playing with OpenSMTPD, I've started replacing Postfix with OpenSMTPD on null mailers and internal relays. My Postfix configuration is pretty much identical on all of those hosts and I've gotten it pretty polished over the years, but there's something about the simplicity of OpenSMTPD that I really like.
I don't envision moving from Postfix anytime soon on my main mail systems (which serve many, many domains and users). If I had a much simpler mail setup I would definitely consider it, though.