The server known as n6.tvscience.co.uk is currently down due to a power outage in the datacentre. Incoming mail is being handled by the backup server and will be delivered to clients once services are restored. Websites are being handled by the mirror server and are thus unaffected. Outgoing e-mail is also unaffected.
We will publish an update when there is further news.
UPDATE: The server came back online at 1915UTC and services were reinstated shortly afterwards.