I see many logs:
Message delivery to the host '199.59.243.105' failed while delivering to the remote domain 'yah.com.tw' for the following reason: The remote server did not respond to a connection attempt.
Message delivery to the host '211.20.188.150' failed while delivering to the remote domain 'pchome.com.tw' for the following reason: An SMTP protocol error occurred.
The SMTP verb which caused the error is 'RCPT'. The response from the remote server is '550 5.1.1 <qvtmooisu@pchome.com.tw>: Recipient address rejected: User unknown in relay recipient ta'.
what are these? seems my server got hacked: someone is using the server to sent up emails. What SharePoint services will deliver these kind of emails? I set up incoming and outgoing emails following the SharePoint documents http://technet.microsoft.com/en-us/library/cc262947.aspx#section3 : basic scenarios not using Exchange server.
