blacklisted ip address

Asothers have reported, I am unable to access any of my virginmedia.com email addresses. My email client returns the message "Temporarily blacklisted IP Address - try again later".

Bizarrely, if I connect my ipad to my phone hotspot, the email will then work correctly.

I have tried calling the virgin customer support people(!) , but I am in the process of moving from a Virgin business account to a Virgin domestic account, so I just get the runaraound from them, with the business team blaming domestic, and vice-versa.

Is this problem linked to today's well reported Amazon outage, our is something happening at Virgin that nobody will admit to?

Has anybody any idea how to solve it?