As per your post https://community.virginmedia.com/t5/Email/Webmail-403-Mailbox-Unavailable-errors/td-p/4294661 I am getting "mailbox unavailable". Not posting my full email address here but can be contacted for details. It is an @ntlworld.com address.
Thanks for your post.
I'm sorry you're not able to access your emails and you're getting the error message.
I'm going to need to unlock the account for you, so I'll pop you a private message now requesting your details and to pass security.
I'll speak to you there.
Thank you for letting me know that you're able to access your email now I've unlocked it for you 🙂