Rather than debate which MTA you should use, you may want to explore a different question: Should you be using...
a full-functioned mail server instead of an MTA? If you see value in features such as mail account management, calendaring, scheduling, contact management, corporate directories and centralized mail storage, you are ready to step up to a messaging server.
There are a number of capable enterprise-ready messaging servers available on Linux, including the commercial product from SendMail Inc., Novell Groupwise, IBM Lotus Domino and Scalix. Open source solutions include the Cyrus IMAP server managed by Carnegie Mellon University. Each of these products should be compatible with your existing sendmail MTA while offering additional functionality and simplified management.
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