coba cek log nya pak
error nya seperti ini :
"The email failed to send due to a configuration issue. "
dari log :
Expected response code 354 but got code "503", with message "503-All RCPT commands were rejected with this error: 503-client.domainxxx.net has no valid DNS please send from a properly 503-configured domain 503 Valid RCPT command must precede DATA "