Very SLOW 1 second - 1 email gone

Very SLOW
1 second - 1 email gone
It was not
help me plase

Delivery settings

Campaigns at once 10
Subscribers at once 100
Send at once 0
Pause 0
Emails per minute 4000

my system
AMAZON Max Send Rate: 90 emails/second

1 second - 1 email send ?? Very SLOW
 
In delivery server do you use Amazon Web API or you have setup SMTP server ?

Check your Delivery server settings as well customer group setting.
 
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