Email has stopped working

It says it’s not connected to the internet when the computer is.
If I send it doesn’t sit in the outbox but it’s not received by recipient.
Cannot receive any emails.
Error alert says that not connecting could be caused by temporary server unavailability or incorrect settings but gives you no help on what that could be. It’s been 3 days now…
Tried hitting repair, nothing.
Version 7, all updates installed, 1 user, email account

When I look in Log it says database disk image is malformed.