[ale] [OT] mail issue with sending mail from managed gmail account to bellsouth email addresses

[jonathan.l.meek at gmail.com (Jonathan Meek)]

Hello everyone,

Has anyone seen this error message before with managed google apps email to
bellsouth email addresses?

======================
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:

      <recipient>@bellsouth.net
        host ff-ip4-mx-vip1.prodigy.net [144.160.159.21]
        SMTP error from remote mail server after MAIL FROM:
     <sender>@nourgroup.com>:
        553 5.3.0 flpd601 DNSBL:ATTRBL 521< 162.144.51.195 >_is_blocked.For
assistance forward this email to abuse_rbl at abuse-att.net
    Reporting-MTA: dns; server.relationshipeconomics.net

    Action: failed
    Final-Recipient: rfc822:<recipient>@bellsouth.net
    Status: 5.0.0
    Remote-MTA: dns; ff-ip4-mx-vip1.prodigy.net
    Diagnostic-Code: smtp; 553 5.3.0 flpd601 DNSBL:ATTRBL 521<
162.144.51.195 >_is_blocked.For assistance forward this email to
abuse_rbl at abuse-att.net

=======================

I plan to the abuse email to see if I can get further details but just
wondering if anyone has seen it before.

Regards,

Jonathan
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