I have been paying for Ultra 50 for some time now. With Ultra 50 you (ostensibly) get access to use port 25.
REF: http://optimum.custhelp.com/app/answers/detail/a_id/876/~/port-25-and-optimum-online
HERE'S THE SCREW:
Once you get your mail server set up to start using port 25, you run into this contrived technicality: you can't send messages to anyone who's worth a damn. Why is that? A technical issue? A misconfiguration? No, something far more sinister.
Most mail servers incorporate various external blacklists to prevent spam. The Spamhaus Project being perhaps chief among them. Well, after getting reject after reject after reject from well known mail servers, you'll arrive at Spamhaus' blocklist removal center and you'll enter in your OOL IP only to get this:
said by https://www.spamhaus.org/pbl/query/PBL151320 :Outbound Email Policy of Cablevision/OptimumOnline for this IP range:
(Jan 2007) Email sent from this IP block via port 25 (SMTP) or port 587 (SMTP-Submit) should be sent only via the designated outbound mail server for OptimumOnline customers: mail.optonline.netWHOA, WHOA, WHOA! Where was this on their port-25-and-optimum-onilne webpage in big bold letters??? Before i began shelling out money for bandwidth I don't actually use?
You might say "why don't you get a business account" --- that's not the point. That's a straw man argument so take it elsewhere.
You might say "why don't you just use their mail relay" --- again, THAT'S NOT THE POINT.
This is insane.
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