>> because SPF is too easy to forge.)
Wrong. When a shared space is used, its up to that particular space, to enforce so customers cannot use other customer’s email addresses. In the same way you cannot, and should not be able to use someu...@hotmail.com <mailto:someu...@hotmail.com> when logged in as anotheru...@hotmail.com <mailto:anotheru...@hotmail.com> , in the same way, Office365, Gmail, AmazonSES etc, should enforce so a customer logged into their SMTP relay with someth...@customer1.com <mailto:someth...@customer1.com> cannot use someth...@customer2.com <mailto:someth...@customer2.com> as sender address. It’s a matter of a simple configuration.
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