Maybe there really is a fault on the server. If so, not much you can do in the client.

Is it your server? I see you sign yourself as "Admin". Is there an error message?

Have you taken this up with the operators of the server?

It just suddenly started to showing this message.. Do you have any idea how i can fix this?

have you contacted our mail provider. The company whose name is after the @ in your email address?

Yes, you are right, it was problem with server. My collegue find solution. It was easy but I do not understand why it stopped suddenly. Thank you guys for feedbuck.

In my experience, servers can develop problems and the operators don't know this has happened until users report it. Sometimes it may only affect a particular set of users because one particular load sharing device or connection has failed.

Even worse, sometimes when told they don't know what to do.

And even more worse, sometimes they just deny that there is a problem.

Yah**! comes to mind…