12-03-2021 11:55 - edited 12-03-2021 12:02
Hi,
We're an ESP sending emails on behalf of cleints who are receiving the following bounce error from virgin media domains (blueyonder, ntlworld, virginmedia) across multiple different domains and IPs:
SMTP service unavailable: "421 4.2.0 MXIN618 Temporary SMC Policy Violation detected, retry later ;id=KdKFlqEMxa7TsKdKFlL2Ap;sid=KdKFlqEMxa7Ts;mta=mx12.tb;dt=2021-03-12T09:39:16+01:00;ipsrc=xx.xx.xx.xx;" received from mx.tb.ukmail.iss.as9143.net (212.54.56.11) while connected from SENDINGDOMAIN.co.uk (xx.xx.xx.xx) to mx.tb.ukmail.iss.as9143.net (212.54.56.11)
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.
If there is elsewhere better to post this question, please let me know and I'll be happy to move it.
Many thanks,
Chris
Answered! Go to Answer
12-04-2021 11:49 - edited 12-04-2021 11:50
As I started this with you I'll add that you are unlikely to get a detailed explanation as to what has happened beyond being told that adjustments were made to the Cloudmark spam filters to avoid these rejections. In all fairness that's all the VM team here get told. I wish we would get more because it helps when dealing with other cases. Interestingly we had two further incidences of this after yours and they have apparently been resolved too. It may just have been a small tear in the fabric of the universe, now repaired, that caused this. Glad it seems to be fixed though. You were a delight to exchange messages with.
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on 12-03-2021 12:05
We do get some interesting errors from the VM mail exchangers here. This is the first I have seen with this one. The six hundred series of MXIN messages seems to be related to the data being sent which the mail exchangers are unhappy with. I shall escalate this to the VM Forum Team here so they can take it up with the people who are in contact with the mail server operation in The Netherlands. These servers are run by Ziggo Internet on behalf of the wider Liberty Media group of which VM is a part. Wait here for the reply. I shall be extremely interested to see what is going on here.
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on 12-03-2021 12:13
on 12-03-2021 12:15
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on 12-03-2021 12:25
Hi Howard,
Was this intended for me? I can't see anything else relating to this message in the forum. Let me know if there's any more info you'd need from me.
Thanks,
Chris
12-03-2021 12:41 - edited 12-03-2021 12:41
Yes it was for you. Do you know what an SMC policy violation is? It's in the error message. I've never the seen the term. I know what the error message code MXIN is saying, at least I think I do. Just asking and chatting.
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on 12-03-2021 12:51
Ahh, sorry! Yeah not sure myself, I've never seen the SMC Policy Violation error before and suddenly we're getting quite a few. The data we're sending to is recently engaged as well so I'd be confused if data quality is a problem
12-03-2021 12:55 - edited 12-03-2021 12:57
You and me both then. I'm not an IT professional, just someone with an interest in this world. As a VIP we get direct access to VM's team here which is why I can escalate and prevent you having to hang around for an answer, or at least get the ball rolling more quickly on finding out what is going wrong.
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on 12-03-2021 12:59
Thanks for your help! I'm usually able to understand what the bounce errors mean most of the time, or actions to take to resolve it but there are a fair few like this one that leave me flabbergasted.
on 12-03-2021 13:14
I've found this:
https://community.ziggo.nl/t5/Internet/Alle-Email-fails-naar-mx11-tb-mail-iss-as9143-net/m-p/738743
You might need to use Google translate to see what is going on. You are likely being greylisted for spam. That should help the VM team here get this resolved for you. I do not advise that you go direct to Ziggo on this.
@ModTeam - to xref with my escalation.
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