Patrik Fältström wrote: > What I don't understand is what you win by separating this on two > different port numbers. With different port numbers, you can apply to the submit port a policy of refusing all unauthenticated transactions. On the same port, one typically needs to accept unauthenticated transactions to local addresses as this is needed for mail relay. A policy of refusing all unauthenticated transactions leads to a more consistent and understandable user experience when unauthenticated mail submissions are attempted.
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