Am 30.03.2015 um 21:42 schrieb David F. Skoll:
On Mon, 30 Mar 2015 21:34:02 +0200 Reindl Harald <h.rei...@thelounge.net> wrote:one reason are the genius MS Exchange setips with a spamfilter in front, set the spamfilter IP to "completly trusted" and by incompetence in that moment also disable the address verification from the spamfilterRecipient verification is disabled by default in Exchange, and it's almost impossible to ENable it in Exchange 2013. :( Microsoft-- We've had to play ghastly tricks to catch bounces from our Exchange-using customers and use heuristics to decide whether or not they're legit. It's the only way we can stay off backscatterer.org
hm - not so long ago talking with a ms admin on the phone he was able to tell me switch which needs to be enabled - not sure which version
but i doubt that exchange don't know it's valid rcpt's and always backscatters with no way to disable that behavior - even in case of microsoft i doubt
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