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My users at prodigy.net are getting the same message as the sbcglobal.net accounts. The error message " ff-ip4-mx-vip1.prodigy.net: 553 5.3.0 flpd575 DNSBL:RBL 521< 220.127.116.11 >_is_blocked.For assistance forward this error to abuse_rbl@...". I have directed my users to contact AT&T as directed by the message.
Hopefully, they will be more responsive then Cox.net in fixing the issue.