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Regarding ip is blocked and can't send emails.

Regarding ip is blocked and can't send emails.

Hi my server has following IP addresses :

155.254.21.127
155.254.29.4
155.254.29.5
155.254.29.6
155.254.29.7
155.254.29.8

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 [144.160.159.21]
    SMTP error from remote mail server after MAIL FROM:<exampledomain>:
    553 5.3.0 flph826 DNSBL:ATTRBL 521< 155.254.21.127 >_is_blocked.For assistance forward this email to abuse_rbl@abuse-att.net"

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