That usually means the address does not exist in Office 365.
On Tue, Sep 28, 2021 at 11:37 AM, Slavko via mailop <mailop@mailop.org> wrote:
> Hi,
>
> my rua report was rejected at RCPT stage with:
>
> SMTP error from remote mail server after RCPT
> TO:<aggrep.dm...@protect-sk.com>:
> 550 5.4.1 Recipient address rejected: Access denied. AS(201806281)
> [DB5EUR01FT030.eop-EUR01.prod.protection.outlook.com]
>
> I search the Internet, but i found multiple similar posts, but no clean
> description what is cause, as most of them talk about something in
> exchange, which i am not familiar with.
>
> Please, can someone explain me, what this rejection means? What is (can
> be) real reason?
>
> thanks
>
> --
> Slavko
> http://slavino.sk
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