On 3/17/2021 9:33 PM, Vaibhav via mailop wrote:
Hi,
We're an ESP sending emails on behalf of clients who are receiving the
following bounce error from virgin media domains (blueyonder.co.uk
<http://blueyonder.co.uk>, ntlworld.com <http://ntlworld.com>,
virginmedia.com <http://virginmedia.com>) across multiple different
domains and IPs:
SMTP Error : *421 4.2.0 MXIN618 Temporary SMC Policy Violation
detected, retry later
;id=MVLFlm4kdboSoMVLGlk2I5;sid=MVLFlm4kdboSo;mta=mx1.tb;dt=2021-03-17T13:32:03+01:00*
*
*
We have tried "sending later", as suggested in the error but no emails
are being allowed through. Would someone please be able to help me
with the cause of this error, and how we may resolve it moving
forwards? I can't find any information on it online nor action I can
take for it to be removed
It's their sender mail compliance or something like that. Your systems
are likely being blocked for sending spam / user complaints. See
https://netreport.virginmedia.com/netreport/ for more info but I don't
know how to reach their postmaster. They have a community forum linked
there as well.
Have you looked at the postmaster hygiene of your customers? Any of
them using things like bought lists? What's your ESP?
Regards,
KAM
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