They missed a spot
Why did they not go gunning for Microsoft as well? Outlook plus Exchange should certainly qualify - Out of Office notifications, automatic classification of (at least some) spam (complete with asking for confirmation from the user)... even Outlook Express (or whatever its current name of the month is) should qualify.
For that matter, you could read the patent as covering pretty much every email system ever written:
a) Receive email "from a source" - yep, covered, even without Matrix-style silliness.
b) Interpret the email using a rule base and case based knowledge engine - well, one rule is that the email must be addressed to a legit mailbox, OR an alias. Add to that any anti-spam or attachment stripping and you're covered.
c) classifying the electronic message as at least one of (i) being able to be responded to automatically; and (ii) requiring assistance from a human operator - bounce messages for the misaddressed emails (at least in some configurations) for (i), or else queue for reading by a human operator (covers (ii)).
Great. They patented the mail server. And possibly much more, depending on interpretation. Quite clearly the Patent Officers either have no background knowledge in the fields they are granting patents in, are in someone's pocket or simply can't read the patent proposals placed before them.