Getting the membership level of a member from the database is not straightforward. Membership information is stored in the `sys_acl_levels_members` table. This table keeps a history, so you have to check the dates to see which membership is currently active. Therefore, Dolphin has to check this table every time it wants to determine the current membership of member. In my opinion, it would have been much simpler to also store the latest membership level on the Profile table.
There is a Profile Exporter module in the market that can be used to extract the Emails for a particular membership level
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