I haven't tried it by sending PMs but I did print out the PM thottling number and tried changing different user groups, and it looks like it uses the largest number out of any group that the user is a member of, unless one of them is '0' (disable PM throttling), in which case throttling is disabled. In other words the user has the most permissions (or least restrictions) of any group they are a member of. (BTW, according to the manual that's the way any permission works, not just PM throttling).
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