Sympatico here in Canada did the port 25 thing about 8 months ago. Basically it makes it a little bit harder for spammers to operate in general, and makes it all but impossible for them to use open relays, which are mostly on port 25. You can get around it by getting your host to provide an alternate port, but that would ruin the advantage of spamming from someone else's server without permission.
I suspect they do it to cut down on the number of "spam from your network" complaints that they are getting. Spamcop complaints can be a pain the ass to deal with.
Alex
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