We had a problem where our server was compromised and got opened up as a relay. This problem is now corrected but I have multiple issues in the aftermath of it.
We have emails that go out and we the receiver get the email, it falls into their SPAM folder and it never did this before. I'm referring to companies we had regularly emailed and still do.
We still have some domains that we can't email to. It appears as if we are blacklisted. See below.
Diagnostic information for administrators:
Generating server: VENUS.LOCAL.iob-gso.com
flpd599.prodigy.net #553 5.3.0 flpd599 DNSBL:RBL 521< 18.104.22.168 >_is_blocked.For information send an email to email@example.com ##
Original message headers:
Received: from VENUS.LOCAL.iob-gso.com ([2002:8101:129::8101:129]) by
VENUS.LOCAL.iob-gso.com ([2002:8101:129::8101:129]) with mapi id
14.03.0224.002; Thu, 27 Oct 2016 08:23:03 -0400
Subject: testing email
Thread-Topic: testing email
Date: Thu, 27 Oct 2016 12:23:02 +0000
I have requested to be unblocked several times but to no avail. I am unsure of where to go with these problems.
Thanks so much!