Blocked Domain, Email or IP address

Hello. Our company email has been blacklisted recently. Our hosting support has helped and corrected the issue, an email was infected and deleted. Please remove us from the blacklist. Thank you so much!

IP listed: 198.20.252.122

Domain: cli.clisanet.com

De: Mail Delivery System
<Mailer-Daemon@cli.clisanet.net> Fecha: 26/1/18 4:16 PM (GMT-06:00) A:
gcavazos@clisa.com Asunto: Mail delivery failed: returning message to sender 
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:

  rosario-marin@sbcglobal.net
    host al-ip4-mx-vip2.prodigy.net [144.160.235.144]
    SMTP error from remote mail server after MAIL FROM:<gcavazos@clisa.com>:
    553 5.3.0 alph166 DNSBL:ATTRBL 521< 198.20.252.122 >_is_blocked.For assistance
forward this email to abuse_rbl@abuse-att.net