Welcome to the forums and thank you for getting in touch. This is certainly something we can take a look at for you.
Just to confirm, is the email linked to an active Virgin Media account? If not, we should be able to remove this with no issue. If it is linked to live services, we may not be able to remove this account.
Re: Delete old virgin media and ntlworld email address
01-08-201909:07 - edited 01-08-201909:09
If they are secondary addresses, you can log in to your billing account at my.virginmedia.com, and go to the manage accounts tab (see photo). That offers the deletion of addresses option. Be warned though, that other customers have complained years later that the addresses are still valid, have been hacked and their personal and financial details are being abused.
So after deleting from your account, run the addresses through mailtester.com and if still valid, come back here to ask VM to sort out the backend mailbox. Only they can perform that.
If it is a primary address you are enquiring about, that cannot be deleted.