GrayHat wrote:
the problem then is... will the NDR sending MTA keep that header ? Or will it just throw away it ? In the latter case the "X-Header" won't be of any help; that's why I thought to "mangling" the mail address since that one WILL be used to send back the NDR
A good question. I'm not suggesting that it should block if its missing - but we should maybe block if its wrong.
I'm going to go through my (legitimate) saved backscatter and see if I can make any additional determinations.
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