Re: Comments on Malformed Message BCP draft

Murray S. Kucherawy <[email protected]> wrote:
>
> I don't think this work is targeted at intermediaries.  In fact, I'd be
> completely fine with expressly saying it's meant to address processing
> at ingress MTAs only.

If you are going to make that kind of restriction, it should happen at
submission servers only.

There is a history of MX servers making "helpful" fix-ups to messgaes
(e.g. inserting missing message-id or from headers) before handing them
over to anti-spam software, which can make spam/legit checks invalid in
both the positive and negative senses. So I think MXs should be as
transparent as possible so that downstream security software is less
likely to have interop problems. Intermediate relays should also be as
transparent as possible.

Tony.
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