replying with OK

[Zsombor B]

Hi,

Is there a way to reply with 'OK' to the sender instead of 'relay  
access denied'?

Reason: thousands of junk emails per day are sent from DEV environment  
to forged recipients but there is only a couple of recipient domains  
are allowed. The others get 'relay access denied' but the developers  
are complaining that their automated tests are falsely failing because  
of the relay access denied response. (I got a promise that the tests  
will be fixed but that will take months and automated test reports  
will be red until then.)

Thank you,
Zsombor