just had a look at the application log on my mail server today and noticed a bucket load of warnings with an id of 7002
Event Type: Warning
Event Source: MSExchangeTransport
Event Category: SMTP Protocol
Event ID: 7002
Time: 8:47:21 AM
This is an SMTP protocol warning log for virtual server ID 1, connection #3438. The remote host "22.214.171.124", responded to the SMTP command "rcpt" with "450 4.7.1 Client host rejected: cannot find your hostname, [x.x.x.x] ". The full command sent was "RCPT TO:<email@example.com
k> ". This may cause the connection to fail.
For more information, click http://www.microsoft.com/contentredirect.asp
I've gone to http://www.abuse.net/relay.html
and put in IP (x.x.x.x) and it comes back saying i'm not an open relay. so i assume thas good.
is this just a case of someone trying to use me as an open relay but can't because i'm locked down?