On 14 Oct 2019, at 23:39, Thomas Walter via mailop wrote:

On 15.10.19 00:34, Chris Wedgwood via mailop wrote:
Doesn't "550 Requested action not taken: We don't like you." apply
after DATA?

it does

most severs honor this but not all

(i experience this sometimes, my domain somtimes gets a lot of
backscatter)

What MTAs do not honor this? How does 550 after DATA result in backscatter?

The problem isn't lack of honoring the bounce. The problem is what to make out of it when multiple recipients are present. Also, assuming that a reject after DATA is strictly content-related is, well, an assumption.

Best regards

-lem

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