The introduction paragraph of section 4.1.2 explicitly links to two
other RFCs for the missing syntax definitions, and indeed the second one
(RFC 5222) contains a proper definition of atext. I did not read the
whole of RFC 5222 recently, but a simple search found this definition
quickly and it seems pretty well-defined. Copying it over to RFC 5321
might be more convenient though.
On 05/11/2011 11:15 PM, Dave CROCKER wrote:
<atext> seems to be an undefined rule in RFC 5321.
This is being noticed in a couple of different fora, so it's worth