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Re:Message threading (1997-2002) by songgao on Sunday September 08, 2013 @09:15PM (#6351323)
Thanks! That's an interesting read. We were actually wondering what was the maximum number of items in References field but couldn't find any. This RFC does give an answer[1]!

[1] http://tools.ietf.org/html/rfc5322#page-25

EDIT: fixed typo

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