This is related to https://aastatus.net/2479 We are problems with the file server for most of our email users. Whilst working on fixing problems with web hosting a problem occurred with the mail store for email. This is being investigated.
As per https://aastatus.net/2479 the file system did not come back after a reboot. The file system was repaired and is mounted again. Mail should be working again, however it may be a little slow. We do apologise for the inconvenience.
Email is back online, things will be a little slow whilst it all catches up.