Thank you for your reply Bob. That doesn't make much sense though: I looked at the content of his last blocked message and the content was the following: "Hello Mr. X, Can You give me information about status of work with PC Y, which was prepared yesterday? Thank You Best Regards Z" This is a direct quote, except for X, Y and Z of course. But anyway: this happens to a lot of his e-mails with the same kind of innocent content. Mails containing single sentences like "Thank you for your invitation. I'll be there." get blocked. I really don't see what can trigger the spam filter. I understand even less why it only happens to this specific user and to none of his colleagues. The only difference - it might be relevant - is that he doesn't work in the office but travels the world. He has a connection to Exchange over an Edge server, not through VPN, so his sender IP changes daily.
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