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a mater of preference - I would choose postfix as I've been using it for years now and its got loads of features and is easy to setup
the smtp server is the least of your concerns, some other things which you need to think about IMHO
which IMAP server will you be using - storage
are your clients using outlook ?
intergration of virtual user lookup in smtp and imap server (mysql backend ?)
spam detection and intergration
transfer of mail to new imap server from exchange