To sum up:
You want to play with
How often you run the command that sends emails + how many emails you send.
If you run your mautic:emails:send command every 10 minutes with a batch size of 150: mautic:emails:send --message-limit=150
Then you will send out 150 emails / 10 min = 900 emails / hour.
Yes it will kill the queue.
The emails wont be sent out.
In Mautic you will see as ‘sent’ because this status is added once the email is “baked” and ready to be delivered = added to the queue.
So if you delete them, it’s the equivalent of the delivery guy ate the pizza. Counts as delivered but you stay hungry.