For the most part, the only data we can put in e-mail is from the event itself, so UDGs are used more for matching than as lookup tables in that way. (State variables are an exception - they can contain multiple elements BUT are not multi-dimensional, just flat lists AND they don't persist over a reboot.) This would be a cool feature request - to be able to pull in supplemental information about the element or agent when sending an email.
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