Re:Complexities of e-mail validation logic
by not2b on Monday May 24, 2021 @03:11PM
(#27268483)
The routing features are obsolete; they go back to the days when lots of email users weren't on the Internet directly and had to use relays. They are still in the spec, yes.
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I assume it comes from similar lineage as UUCP paths. Either way, email standards are a bit ridiculous. It needs the kind of rehaul that occurred with HTML5 of looking at what email implementations actually do and pushing them in one direction. I suspect that is not happening ever, so failing that there will probably always be things in the spec that just simply don’t work across everything anymore.