> I can boil it down to this: these headers may leak out, if there are bugs
> or unusual behavior. But I have realized ... I don't care.
I do care. "Be conservative in what you do"
> Thinking about it more, we already leak some "internal" headers out.
Water under the bridge. Let's do the right thing moving forward.
You mentioned "harm": it depends on how that's defined. Sure, MUAs can
igore headers, so no harm there. But, I define each of intentionally
withholding traceability and polluting a namespace as harmful.
> I mean, yeah, it's not something we should do,
Then let's not.
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