asking for refund

@dremoussenard I think you were not able to run or tweak mailwizz properly..
Mailwizz is a great Product i have ever seen we are using same product with some modification to core files to send 10M-20M per hour in production with many features.
for sending 2M -3M emails a day mailwizz can be used out of box with little tweaks in Mysql Apache/NGINX etc.. to match your expectation . A big community is here to help you mate.

We are thankful to @twisted1919 for this Amazing product & support.