It looks like Apple might be employing Sun’s Java Messaging Server (Grid?) for the behind the scenes heavy lifting that enables the new MobileMe functionality.   Performing a telnet to "smtp-mx1.mac.com" on port 25 MacTalk User MacTicks got the following response:

$ telnet smtp-mx1.mac.com 25
Trying 17.148.20.64…
Connected to smtp-mx1.mac.com.
Escape character is ‘^]’.
220 smtpin122.mac.com — Server ESMTP (Sun Java(tm) System Messaging Server 6.3-6.03 (built Mar 14 2008; 32bit))
quit
221 2.3.0 Bye received. Goodbye.

We followed up today with the same request and got the following:

$ telnet smtp-mx1.mac.com 25
Trying 17.148.20.64…
Connected to smtp-mx1.mac.com.
Escape character is ‘^]’.
220 smtpin123.mac.com — Server ESMTP (Sun Java(tm) System Messaging Server 6.3-6.03 (built Mar 14 2008; 32bit))

So it looks like Apple is using Sun for its MobileMe mail platform.  As a background, Sun and Apple have had a long and tumultuous cross-Valley relationship with many technology sharing arrangements
 

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