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one email provider setup its server to return 452 error when you are tring to send email to its user. if you a spammer you would not send message again and if you "normal" server you wil try to send this emall again and again and finally that server accept your email.
the problem is that KWF catch that 452 error (however 4xx are temporally not fatal errors), return my mail server 250 code that means everything done, and send email to user with such body:

KWF was unable to deliver message. Remote server's reply:
452 Try again later

does anybody know how to prevent KWF sending this email to user and pass 4xx error codes to mail server?
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