Can you get online ok, if so the should be no problems retrieving your emails.
Which email client do you use for email, and do you know your password.
You can retrieve your email here if you know the password
http://webmail.ntlworld.com/
If you are still having trouble then try the phone numbers below.
Tech Support is open 24/7 on the numbers below.
For help with your TV or Phone and for Broadband Technical Support:
Call Product Support/Faults on 151 option 3 from your Virgin Media Phone. It's absolutely free.
Or call 0845 454 1111 from any other phone line.