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. It just says it implicitly, not explicitly, but:

It's not possible to construct Message-Id without the "@" while conforming
to any of mentioned RFCs.

Also note that if you demand that MIDs contain '@' with conforming strings on both sides, you risk losing mail that users want. This is a mistake I have made.

what exactly was the problem? Message-Id without the "@" or the
non-conforming parts there?

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