Simply show me a software that meet these requirements

I was trying to use UltraMailer, that can be downloaded here: vn.ultramailer. org But the only license I could get on the internet was this one: Email: vdpchecker@ gmail .com Key: LAYB-MDO0-DATC-C5H9-P5G4-A43U And guess what? It doesn't work anymore. So now I'm here requesting a good mailer that works like UltraMailer. It has a feature that you can add thousands of mail SENDERS, and then you can tell the program to switch between the senders every 100/200/300/400... sent emails. I tried something around 10 mailers, but not even one of them has this feature. You can only choose one sender, and then you need to manually choose another sender, etc. You have 2 options: - Show me another software that has this feature of sending by multiple senders. - Get me another license key Easy as 1+1. =)