well, in sbc-dsl-land, port 25 and port 587 are blocked, but port 26 gets
through. it seems bizarre that port 587 would ever be blocked
I suspect that was some kind of temporary aberration. SBC started
blocking port 25 in the last two months, and during that time I've
helped at least a dozen of our customers using SBC DSL switch their mail
program settings from port 25 to port 587, with no trouble -- it worked
in every case.