For the past three or four weeks I've had intermittent problems sending emails to a Virgin Media address; a couple of days after sending an email to that address, my ESP will inform me that it couldn't be delivered. I see there are already a couple of other threads on this:
https://community.virginmedia.com/t5/Email/Reg-Virginmedia-SMC-Policy-Violation-bounce-error/td-p/46...
https://community.virginmedia.com/t5/Email/virginmedia-SMC-Policy-Violation-bounce-error/m-p/4652538
These are the relevant details from the error messages I've been receiving:
Reporting-MTA: dns; gmmr3.centrum.cz
X-Postfix-Queue-ID: 8848018007FA2
X-Postfix-Sender: rfc822; *****@volny.cz
Arrival-Date: Mon, 7 Jun 2021 07:46:00 +0200 (CEST)
Final-Recipient: rfc822; *****@virginmedia.com
Original-Recipient: rfc822;*****@virginmedia.com
Action: failed
Status: 4.2.0
Remote-MTA: dns; mx.tb.ukmail.iss.as9143.net
Diagnostic-Code: smtp; 421 4.2.0 MXIN618 Temporary SMC Policy Violation detected, retry later ;id=qtPVllKr1Lzi7qtPVlSLxl;sid=qtPVllKr1Lzi7;mta=mx11.tb;dt=2021-06-09T10:18:02+02:00;ipsrc=46.255.225.251
I'd be grateful for any assistance in resolving this.
