Given your description as a voice mail back end, just about any IMAP
server is suitable.
UW imapd would be quite a bit easier to set up than Cyrus. Nothing
prevents you from moving to Cyrus in the future if that turns out to be
the goal. UW imapd even comes with a nice tool, mailutil, which assists
in the process; thus making UW imapd a good "first server" even for those
sites which ultimately will run on other sites.
I would suggest giving serious consideration to a mailbox format other
than the traditional UNIX mailbox format which is UW imapd's default.
The bleeding edge would be to use the new mix format; however for your
purposes the more tried-and-true mbx (not mbox!) format would be alright.
Run it on a Linux system, not commercial UNIX (that is, not Solaris, AIX,
HP-UX, etc.). Then you don't have to worry about the performance problems
with large password files that some commercial UNIX systems have.
-- Mark --
http://staff.washington.edu/mrc
Science does not emerge from voting, party politics, or public debate.
Si vis pacem, para bellum.
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