What is your goal, how many emails do you want to reach in an hour let's say?
Tell us more about your server that hosts about mailwizz(ram/cpu/storage) and about your smtp server including the smtp server software(postfix/exim/etc)
I want to send 6 campaign par day
in first time, 6 x 50K and after 6x 100k and final 6x150k
And is it possible to send 12 campaign of 150K par day
thank you
I don't see how that would be possible with your current server.
Maybe you can make it happen for a few days, but then once the database grows, this small server won't cope with what you want to send at all.
However, you should try and see where you get, look into send-parallel-campaigns at http://www.mailwizz.com/article/increase-delivery-speed-recursive-or-parallel-processing for a start and see how far you go with that.