This is an SMTP protocol error log for virtual server ID 1, connection #4. The remote host "x.x.x.x", responded to the SMTP command "xexch50" with "504 Need to authenticate first  ". The full command sent was "XEXCH50 2180 2  ".  This will probably cause the cThis is an SMTP protocol error log for virtual server ID 1, connection #4. The remote host "216.254.177.76", responded to the SMTP command "xexch50" with "504 Need to authenticate first  ". The full command sent was "XEXCH50 2180 2  ".  This will probably cause the connection to fail. 

onnection to fail.