On 12/07/2021 12:00, Jaroslaw Rafa via mailop wrote:
They required SMTP AUTH for all messages
received on port 25 with the sender from their domain and rejected the
messages if the session was not authenticated. A crazy idea, but they did
exactly this.
I do this. For a corporate email system is makes a lot of sense. I
shouldn't be receiving email externally with a From: domain which is local.
We've had some very targeted scams, and it is just 1 line in the defence.
It will get relaxed a bit soon, because some of our email is getting
outsourced, and so I'll be checking for auth or valid DKIM.
Tim
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