Hi,
You could create a segment excluding all Virgin Media email addresses and suppress them in your campaigns and flows if they have bounced even once.

Also I know some ISPs (such as Xfinity) have a Postmaster tool...in case Virgin Media has one too I would suggest checking it out

Hey @am-e-mail 

I agree with @Fario Consulting that it would be best to isolate the Virgin Media accounts and send directly to them, so you can do some testing. 

Check some of the profiles so see if they are genuine customers also as they may be multiple spam accounts that would always bounce that have subscribed.

Lastly i would just triple check your domain settings, check all the DNS settings are set up correctly and the status is green. And also just checking all your DMARC/DKIM settings for your domain are all in the green too.

Hey @am-e-mail 

As @Fario Consulting and @TimMartinHarvey mentioned i agree, that it would be best to isolate the Virgin Media accounts and include them as a individual segment for your campaigns or flow, just to be able to see directly, what impact the sending have for those kinds of profiles. 

From my experience, we’re seeing very different results for various clients, which is sending to Virgin Media inboxes - So i think the best way would be to tag those subscribers and include those in a segment to see the actual impact. 

Hope that helps! :-) 

Christian Nørbjerg Enger
Partner & CPO
Web: Segmento.dk
LinkedIn: @christianfromsegmento
Voldbjergvej 22b, 8240 Risskov