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Are there constraints on the length and/or format of SMTP message-id’s? I.e.: How long may they be, and are only certain characters allowed? (I plan to use only ASCII, but I fear that there may even be ASCII characters which aren’t allowed.)
RFC822 defines this, but are there updated RFCs or common real-World aspects (such as common bugs in mail software) which should be considered?
The updated RFC is RFC2822.
As of characters allowed, it basically
(It’s also possible to quote literals).
It has to contain @ separating ‘local part’ and ‘domain part’. It MUST be globally unique.