Phillip Hallam-Baker <phill(_at_)hallambaker(_dot_)com> wrote:
At the moment the mail systems make no distinction between someone outside
my company sending me a ZIP file and me sending a ZIP file to my engineers.
That is due to the mail protocols being defective.
No, that's poor configuration by your postmasters. It's straightforward
and quite common to configure distinct security policies for internal and
external mail, based on whether the message arrived via your submission
service or your MX service.
Tony.
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