+++++++++++++++++++++++++++
  R:userx@test.ex -44 13121 SMTP error from remote mail server after RCPT TO:<userx@test.ex>: host 127.0.0.1 [127.0.0.1]: 451 Recipient not OK
first failed = time last try = time2 next try = time2 + 1

******** SERVER ********
Listening on port 1224 ... 
Connection request from [127.0.0.1]
220 ESMTP
EHLO myhost.text.ex
250-OK
250 HELP
MAIL FROM:<CALLER@test.ex>
250 Sender OK
RCPT TO:<userx@test.ex>
451 Recipient not OK
QUIT
250 OK
End of script