Migrating to port 587 for AUTH doesn't really seem useful. Unless there is an end goal of separating MTA -> MTA traffic from MUA -> MTA traffic, it seems to me that SMTP AUTH should be used everywhere on port 25...no need to move everything to a separate port except due to ISPs who choose to shut down port 25 usage except to their servers.
It isn't due to ISPs shutting down port 25. There is an end goal of separating the two types of traffic. See RFC2476 for details. It was written in 1998, but one of the reasons was to help stop spam.
-Scott
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