On 17/09/2024 12:15, Sebastian Arcus via mailop 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.
Just a follow up to the issue above. I have managed to find a different
error message in my relay server. It had a 554 error - the IP address of
the MX is blacklisted at csi.cloudmark.com. It seems this database is
not included in the MX Toolbox blacklist scan. There is no information
as to what the reason for the blacklisting is - so I will just apply to
have it removed.
Thank you to everyone for the helpful suggestions
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