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How to increase email sending atch size?

Hi Team,

I am using Phplist v3.5.5 installed on virtualmin and ubuntu 20.04.
I am trying send campaign to around 8200 email subscribers. The campaign get stucked after 300-400 emails. And log shows sending batch of 10 emails.
I spoke to hosting server executives about limitation, got reply that there is no limitations from server side.
Need guidance to increase batch od email to at least 5000/hour.