On 4/16/2025 9:22 AM, Wei Chuang wrote:
I suspect the include-list approach will likely ignore X- headers, while exclude-list will by default include signing all of them. The latter will be more sensitive to the rumored MTAs that delete arbitrary X- headers that will need help from the header algebra.
The X- naming construct was quite a nice idea -- not mine, though I thought it clever and I don't remember who suggested it during the discussions that produced RFC822 -- but it turned out to be far more problematic than beneficial.
It was eventually deprecated. d- -- Dave Crocker Brandenburg InternetWorking bbiw.net bluesky: @dcrocker.bsky.social mast: @[email protected]
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