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Re: [ietf-smtp] Curious, with this now being associated to emailcore, should list name change?

2020-07-21 22:16:56
On 7/21/20 9:08 PM, John C Klensin wrote:

I think it's slightly deeper than that, which is that every
time one party adds a new header field, some number of other
parties decide that they can delete or modify that field, or
use it to validate or invalidate the message.   So random
parties making random decisions about message headers are
detrimental to email reliability.
I agree with that.  But that is the justification for registered
header field names, preferably well-documented and stable ones.

I suspect this is not an issue that can be addressed by any combination of registration and/or field-naming constraints in the absence of instructions to message-handling software about which fields (if any) they can add, modify, or delete.

I love the format's extensibility but I suspect there's a point of diminishing returns.   The message header has become a garbage dumping ground, and it might need some cleaning up.


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