Verizon.net Finally Moving Email To Port 587
The Washington Post's Security Fix blog is reporting that Verizon, long identified as the largest ISP source of spam, is moving to require use of the submission port, 587, in outbound mail — and thus to require authentication. While spammers may still be able to relay spam through zombies in Verizon's network, if the victims let their mail clients remember their authentication credentials, at least the zombies will be easily identifiable. Verizon pledges to clean up their zombie problem quickly. We'll see.
From the parent's posting:
After talking with SORBS, I contacted Verizon and found out that, even though we signed up for Verizon Business, they limit the amount of email I can send a week to 500 messages.
Sounds like commercial mail to me. Sounds like SPAM.