On 1 Jan 2018, at 10:47, Matus UHLAR - fantomas uh...@fantomas.sk> wrote:

On 1 Jan 2018, at 11:41 (-0500), Matus UHLAR - fantomas wrote:
the gross format in RFCs 822,2822 and 5322 describes message-id consisting
of local and domain part, thus is must contain "@".

On 01.01.18 12:17, Bill Cole wrote:
No, it does not. Re-read the cited sections. From RFC5322, the ABNF definition:

 msg-id          =   [CFWS] "<" id-left "@" id-right ">" [CFWS]

this is the part that says message-id must consist of local and domain
parts.

On 02.01.18 13:44, @lbutlr wrote:
No, it doesn't say anything like that.

ok, let's rephrase that: it says that the message-id consists of two parts
and the "@" between them.

As I already posted:

5322 specifically states: "Though other algorithms will work, it is
RECOMMENDED that the right-hand side contain some domain identifier
(either of the host itself or otherwise) such that the generator of the
message identifier can guarantee the uniqueness of the left-hand side
within the scope of that domain."

There is no requirement to include a local and domain part in any part of a 
Message-ID.

while it's "only" recommended that the right part is a domain name, but
there must be right part.

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