Why would you install SME Server 8.0 whilst the latest stable version is 8.1 and even 8.2 beta is available?
Um, isn't the latest stable version 9.0, with 9.1 beta being available?
@ahmedsa, is there some reason you can't just paste the error message here? Having to run flash player just to read a text error message just seems silly. If you have to post the error message elsewhere, pastebin.com works well and doesn't mess around with the content.
Having looked at the headers of that message, though, there isn't anything obvious (to me) that's wrong. The only thing that's at all close is the message "X-Get-Message-Sender-Via: webx1.awalnet.com: mailgid no entry from get_relayhosts_entry" (repeated several times). I've sent two test messages to that same address to see what (if anything) comes back.