******** SERVER ********
Listening on port 1224 ... 
Connection request from [127.0.0.1]
220 ESMTP
EHLO myhost.test.ex
250-OK
250 HELP
MAIL FROM:<CALLER@myhost.test.ex>
250 Sender OK
RCPT TO:<userx@domain.com>
452 Temporary error
QUIT
250 OK
End of script
Listening on port 1224 ... 
Connection request from [127.0.0.1]
220 ESMTP
EHLO myhost.test.ex
250-OK
250 HELP
MAIL FROM:<CALLER@myhost.test.ex>
250 Sender OK
RCPT TO:<userx@domain.com>
452 Temporary error
QUIT
250 OK
End of script