******** SERVER ********
Listening on port 1224 ... 
Connection request from [127.0.0.1]
220 Welcome
EHLO myhost.test.ex
250 OK
MAIL FROM:<CALLER@test.ex>
250 OK
RCPT TO:<fail.transport@test.ex>
550 Recipient refused
QUIT
250 OK
End of script
Listening on port 1224 ... 
Connection request from [127.0.0.1]
220 Welcome
EHLO myhost.test.ex
250 OK
MAIL FROM:<CALLER@test.ex>
250 OK
RCPT TO:<fail.transport@test.ex>
550 Recipient refused
QUIT
250 OK
End of script