I'm running exchange on an SBS server, and when I look in my event logs I see these messages
This is an SMTP protocol log for virtual server ID 1, connection #92. The client at "18.104.22.168" sent a "rcpt" command, and the SMTP server responded with "550 5.7.1 Unable to relay for some-address ". The full command sent was "rcpt TO:<some- address>". This will probably cause the connection to fail. For more information, click http://www.microsoft.com/contentredirect.asp
As far as I know my server shouldnt be relaying messages is there a way I can stop this?