It appears that the current problems are affecting more than just email services.
FTP access is not working, Filezilla shows an immediate "connection cleared by server", and access to my web pages is unavailable with a "Service Unavailable The service is temporarily unavailable. Please try again later." message.
Hopefully the status page update at 8a.m. will cast some light on what is happening.
It doesn't. And despite being already logged in, the "service" to raise a ticket requires logging in again - which just spins endlessly. And 80% of yesterday's emails are missing.