Open letter to Earthlink

Mail from my list server (, ip to [your customer] is getting bounced with the message:

<[your customer]>: host[] said: 550 Dynamic IPs/open relays blocked. Contact <>. (in reply to MAIL FROM command)

And when I try to email the address that it says to contact, I get a further bounce:

<>: host[] said: 550 Unknown local part openrelay in <> (in reply to RCPT TO command)

First of all, I’m not an open relay. Never have been, never will be. And unlike you, when I have an error message say “Contact:”, I make sure the email address actually exists. Can you bozos please fix your open relay check, and fix your bounce messages?