Maximum internet email Message-ID length
I'm looking for the maximum character length allowed for an internet Message-ID field for validation purposes within an application. I've reviewed sources such as RFC-2822 and Wikipedia "Message-ID" as well as this SO question , among other various places. The closest answer I can find is "998 characters" because that is the maximum length that the specification allows for each line in an internet message (from RFC-2822), and the Message-ID field cannot be multiple lines. Is 998 characters the definitive answer? Is there no such limit? If there's one thing I've learned about email, it must be