Random thought - Have you validated that their email authentication is
configured properly for the mail they are sending?
originprobate.com
"spf":
"record": "v=spf1 mx -all",
"valid": true,
"dns_lookups": 1,
"dns_void_lookups": 0,
"warnings": [],
"parsed": {
"pass":
"value": "cumaru.open-t.co.uk",
"mechanism": "mx"
"dmarc": {
"record": null,
"valid": false,
"location": null,
"error": "A DMARC record does not exist for this domain or its base
domain"
~ Matt
On Tue, Sep 17, 2024 at 7:21 AM Sebastian Arcus via mailop <
mailop@mailop.org> wrote:
> Hello list. In the last few days Virgin Media in UK (@virginmedia.com,
> @ntlworld.com) have started to bounce emails from one of the domains I
> manage. There isn't a lot to go on - as being a 550 message, there isn't
> any info about being blacklisted or similar. I am working on the
> assumption that they have some sort of spam filtering in place, and this
> domain or its IP address might have been blacklisted somewhere. The
> domain name is @originprobate.com and it is a really low email volume
> domain, with no marketing or similar activities. I checked at MX Toolbox
> both the domain name and the MX IP address (which is used by a few other
> domains I manage) and both come back clean. The other domains haven't
> experienced any issues yet, so it seems the IP of the MX is clean. There
> hasn't been any recent change in settings at our end that I can think of.
>
> I've searched online but can't find if Virgin Media UK has some sort of
> form to fill in or contact details to check if a domain is blacklisted
> with them, or to submit an application to remove from such a blacklist,
> if one exists.
>
> Does anyone here have experience of dealing with Virgina Media UK or
> some insight as to what their approach is? I would think it is a poor
> idea to reply with "550 - Mailbox unavailable" when rejecting suspected
> spam, instead of some appropriate message - but different administrators
> seem to have different views on how email should work. Such is life.
>
> Any suggestions to move this further are much appreciated.
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> mailop@mailop.org
> https://list.mailop.org/listinfo/mailop
>
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