How does randomize subscribers work?

theseagull

New Member
Suppose I have 9000 subs in my list which have been added from 1st Jan to 30th Jan

If I mail to 6000 subs and select do not randomize subscribers, does it select the oldest 6K or the newest 6K to send message to?

I understand that randomize sub will send to any 6K at random
 
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