Emails Being Blocked By IP Number
All of the email we try to send to our clients that have AT&T related emails are being blocked. This has been going on for a month maybe. I submitted a report asking to be removed and have not received a satisfactory outcome.
I've thoroughly checked our logs and there is no indication that our mail server is spamming anyone.
Here is a sample output from Postfix:
Apr 14 14:01:40 [Mail Server Name - Redacted] postfix/smtp: BC18F41C: to=[Recipient Redacted]@sbcglobal.net>, relay=al-ip4-mx-vip2.prodigy.net[188.8.131.52]:25, delay=0.62, delays=0.04/0.04/0.47/0.07, dsn=5.3.0, status=bounced (host al-ip4-mx-vip2.prodigy.net[184.108.40.206] said: 553 5.3.0 alph148 DNSBL:ATTRBL 521< [OUR IP NUMBER - REDACTED] >_is_blocked.For assistance forward this email to firstname.lastname@example.org (in reply to MAIL FROM command))
Please unblock the IP number, which I will provide via PM.