Am 07.09.2016 um 11:00 schrieb Nicola Piazzi:
I am off topic if you think that postfix is not spamassassin
I think that this is not a Microsoft problem because exchange answer correctly 
to unknown recipients
I suppose that there is something in the return string that postix doesn’t like

postfix don't parse strings, postfix is just interested in the 3-digit response code where 2xx means "OK", 4xx "temporary problem" and 5xx "permanent problem don't come back"

"250 2.1.5 Recipient OK" is a corret answer to unknown recipients?
since when?

Here Exchange 2016 at port 25 that verify unknown recipient at DATA
phase telnet 10.1.1.126 25
220 GEMMA.gruppocomet.net Microsoft ESMTP MAIL Service ready helo me
250 GEMMA.gruppocomet.net Hello [10.2.6.4] mail from:e...@ext.com
250 2.1.0 Sender OK
rcpt to:doesntex...@gruppocomet.it
250 2.1.5 Recipient OK

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