[Evolution] Help: "destination service is currently unavailable" ???

["ml" <ml mariochiari net>]

Hi

my Evolution stopped to send/receive. When I try, i get the following message:

"The message will be saved to your local Outbox folder, because the destination service is currently unavailable. You can send the message by clicking the Send/Receive button in Evolution’s toolbar."

I have not a clue about the possible culprit.

Thanks

mario