And I am getting the error message while sending an email to remotedomain.com ,I also sent anb email to abuse-att but there is no reply since 4-5 days , so please delist our server IP if you need any information then let me know. Error message is below:
"This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
<Remote Domain> host ff-ip4-mx-vip1.prodigy.net [22.214.171.124] SMTP error from remote mail server after MAIL FROM:<exampledomain>: 553 5.3.0 flph826 DNSBL:ATTRBL 521< 126.96.36.199 >_is_blocked.For assistance forward this email to firstname.lastname@example.org"