In Section 4.4 on Trace Information, the "ID" clause of the
Received field is defined as
ID = CFWS "ID" FWS String / msg-id
This is claimed to be inconsistent with RFC 2822, which only
permits msg-id.
"String" is there to provide additional flexibility for
gateways, etc., for which a message-ID format may not be
appropriate, but it has been suggested that we remove it in the
interest of consistency.
Question: Is the production correct as is, or should "String" be
eliminated as a possibility?
Note that, if the answer is "ok as is", we may want to think
about whether we are happy with the syntax in in 2822.
john