Webmail & Atmail both use IMAP to access your online mailbox (ie. mail still held on the server).
If you have created a mailbox then you can now use Webmail or Atmail to access them.
Access at: https://webmail.ukservers.net
Webmail offers a basic interface but nevertheless is very useful when out and about to view mail on the server. Webmail also has some useful filtering options that work outside of webmail across your mailbox (good for filtering nuisance emails when spam filtering doesn’t help).
Access at: https://atmail.ukservers.net
Atmail is a modern looking browser client.