Well you might want to consider Postfix since it is
the closest drop in replacement for sendmail. That is
its intent from day one. Courier smtpd really can't say
other than if Courier-Imap is any indication it is very
good. Exim don't know. QMail that is quite diff than
Postfix and Sendmail from experience. Postfix is extremely
easy to setup. I would try that first before rolling all
the way back to Sendmail 9.x.x or whatever it is now.
It also works well with Courier-Imap and Maildirs.
.. The unknown var is what does incremail actually do?
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