Open a terminal windows and run the following command:
curl -IL http://mail2.virginmedia.com
Post the resulting output here (redact if needed), for example:
HTTP/1.0 301 Moved Permanently
Location: https://mail2.virginmedia.com
Server: BigIP
Connection: Keep-Alive
Content-Length: 0
HTTP/1.1 400 Bad Request
Date: Wed, 09 Mar 2022 18:45:42 GMT
Server: Apache/2.4.6 (CentOS)
Strict-Transport-Security: max-age=31536000; includeSubDomains
X-Frame-Options: SAMEORIGIN
Referrer-Policy: same-origin
Feature-Policy: vibrate 'self'
Connection: close
Content-Type: text/html; charset=iso-8859-1