No, see RFC 2821 or 5321 sec 3.3. The reverse-path is what's between the brackets, which means it's a mailbox or it's empty.Ok, I guess I didn't expect to have to go through a layer of english while assembling a grammar from different sources, given that there was an ABNF rule with a matching name.
Figuring out the actual syntax of A-R is quite hard because there are so very many external references.
Even the ABNF is tricky -- I had to stare at the definitions of resinfo and propspec and pvalue for quite a while to confirm that your interpretation was correct.
A lot of people (not you) when reading RFC 5234 assume that there has to be only one way that the BNF can match a string. That's not true, ambiguous matches are allowed, and sometimes can make the ABNF simpler.
Regards, John Levine, [email protected], Taughannock Networks, Trumansburg NY Please consider the environment before reading this e-mail. https://jl.ly
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