I've got a Fasthosts email domain as well - there is a webmail interface:
https://webmail.livemail.co.uk
There's a configurable spam filter available if you've got the Starter Plus or above account:
https://help.fasthosts.co.uk/app/ans...x-spam-filters
Oddly, you don't configure spam settings from within the webmail client itself, but rather using your account Control Panel. This does make it harder to add email addresses / domains to a block list, but it's better than nothing.
HTH
SD