Send failure

I cannot send out any emails from EM client. I have the latest version installed. I am receiving ok so I know it is not my internet connection. The message that comes up is as follows:-
 An attempt to connect to failed. This could be caused by temporary server unavailability or incorrect settings.
 This problem has been going on for 3 days I have shut down and rebooted but nothing seems to fix it.

Try disabling your anti-virus software and the attempt a send.  If it succeeds, you will have to configure the AV software with an exception for mailclient.exe.  This can happen on occasion when the AV software is updated.

Thanks Jay, problem sorted