Account Inactive

Account Inactive

Hi,

We've been using your mail service with our domain (flawlessly) for almost a year now, but this past week, we've been unable to log into any of the following email accounts, and the web interface reports the error "Account Inactive".
The affected accounts are
office@brixhamcc.co.uk
admin@brixhamcc.co.uk
andi@brixhamcc.co.uk
brixhamcc@gmail.com

Wondering if they can be reactivated, and what we need to do in future to stop this happening again?
Best Regards
Oliver 
(On behalf of Brixham Community Church)