On 7 Apr 2018, at 11:42 (-0400), Sebastian Arcus wrote:

Do the standards really require a message id to be in all lower case?

Of course not, and that's also not an accurate description of MSGID_SPAM_CAPS.

A small minority of rules in SA are based on any external standard. They are empirical and pragmatic, not legalistic. There is a complex analysis of multiple mail streams used to generate scores for the rules and to decide which rules are good enough to publish in updates, run on a daily basis because it takes most of a day to run. The fact that MSGID_SPAM_CAPS exists with that name (and mot with a 'T_' or developer's tag prefix) implies that at some point in the past it was reliable enough as an indicator of spam to be part of the default set.

Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Currently Seeking Steady Work: https://linkedin.com/in/billcole

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