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.
Yeah, here's how I feel about that:
- Traceability - I mean, why is this an issue? Who would really care? I'm
trying to imagine the scenario here; we a) leak a header called "Forward"
b) someone notices, c) someone CARES enough to decide this is a problem,
and d) wants to track down the MUA responsible.
- Polluting the namespace - I mean, also ... really, is this a thing we
should have to worry about? If it happens, and it seems like it's easy
enough to prevent.
These are pretty abstract concepts to me; I'm trying to see how this
really would impact anything. Also, copying other art ... the few MUAs
that do stuff similar to this (mutt is the prime example I could find)
use headers for this purpose without any special prefix, and no one
seems to care.
--Ken
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