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Changes between Initial Version and Version 1 of Ticket #3229, comment 1

-                      initial
+                      v1
 Inside of `bbp_get_email_addresses_from_user_ids()`, we opted to use `get_users()` and use `all_with_meta` to prime the user objects for future/immediate use, and then just pluck `user_email` out of the results.
+This means we can reference the user object and use `user_registered` without hitting the database, though we would be duplicating some effort with somewhat goofy function calls.
 We also switched to sending 1 email and using `Bcc:` headers to minimize SMTP wait time inside of a `foreach()` loop, which is in direct conflict with sending unique headers per-user as would be required by this enhancement.
+This is not very great, as I think we'd need to revert back to sending many individual emails again, something that has already proven to be problematic for users in the forums.