Although (ahem) I have no personal experience with Exim, several engineer-friends who worked at extremely large installations (hundreds of dns servers, internal routers, etc.) all mentioned Exim as what I should use when I was bitching about sendmail.
If one is going to work with sendmail (which I think works fine for simple configurations...not that hard) I recommend the O'Reilly book on sendmail...quite informative.
mike
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