+++++++++++++++++++++++++++
  R:userx@test.ex:<CALLER@test.ex> -44 13121 H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after RCPT TO:<userx@test.ex>: 451 Temporary error
first failed = time last try = time2 next try = time2 + 2
  R:usery@test.ex:<CALLER@test.ex> -44 13121 H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after RCPT TO:<usery@test.ex>: 451 Temporary error
first failed = time last try = time2 next try = time2 + 2
+++++++++++++++++++++++++++
  R:userx@test.ex:<CALLER@test.ex> -44 13121 H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after RCPT TO:<userx@test.ex>: 451 Temporary error
first failed = time last try = time2 next try = time2 + 4
  R:usery@test.ex:<CALLER@test.ex> -44 13121 H=127.0.0.1 [127.0.0.1]: SMTP error from remote mail server after RCPT TO:<usery@test.ex>: 451 Temporary error
first failed = time last try = time2 next try = time2 + 4

******** SERVER ********
Listening on port 1224 ... 
Connection request from [127.0.0.1]
220 ESMTP
EHLO the.local.host.name
250 HELP
MAIL FROM:<CALLER@test.ex>
250 OK
RCPT TO:<userx@test.ex>
451 Temporary error
RCPT TO:<usery@test.ex>
451 Temporary error
QUIT
250 OK
End of script
Listening on port 1224 ... 
Connection request from [127.0.0.1]
220 ESMTP
EHLO the.local.host.name
250 HELP
MAIL FROM:<CALLER@test.ex>
250 OK
RCPT TO:<userx@test.ex>
451 Temporary error
RCPT TO:<usery@test.ex>
451 Temporary error
QUIT
250 OK
End of script