How to know if a user has enabled 'email this user' feature

This query is marked as a draft This query has been published by Jmorgan (WMF).

An example.

If the user has disabled Special:EmailUser in their preferences, they will not have an entry in user_preferences for up_property = disablemail.

SQL

select u.user_name, u.user_id, up.up_property, up.up_value 
from enwiki_p.user u join enwiki_p.user_properties up 
on u.user_id = up.up_user 
where u.user_name = "Missvain";

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