If you want to share the IP(s) you're sending from I might be able to provide more specifics for you but it's all about backing off, reducing the volume of data you're trying to send and the amount of recipient network resources you're trying to use up.
On Thu, 18 Mar 2021 at 01:34, Vaibhav via mailop <[email protected]> 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, > ntlworld.com, 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 > > --Vaibhav > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop > -- James Hoddinott
_______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
