Whenever I try to send something to emails in @att.net I get a reply:
host ff-ip4-mx-vip1.prodigy.net[126.96.36.199] said:
553 5.3.0 flph831 DNSBL:RBL 521< MY.IP4.ADD.RES >_is_blocked.For assistance
forward this error to email@example.com (in reply to MAIL FROM
Of course emails to abuse_rbl go unanswered.
My IP turns clean on https://www.dnsbl.info/ (all green and one blue timeout).
Anyone had such issues? Any working contacts to AT&T email?
Any help appreciated.