Greyson Parrelli 4714895c59 Do not attempt to send to unregistered users when using CDS flag.
CDS is slow, and unregistered users will always trigger a CDS lookup on
send (since we can't get their UUID).

This starts skipping sends to unregistered users and shortens the time
window to do a full CDS lookup from every 12 hours to every 6 hours.
2020-08-31 11:33:57 -04:00
..
2020-02-28 17:35:13 -05:00
2020-08-28 10:49:31 -03:00