MailBomber using SMTP multiples accounts with multiples proxies, provider handled : mail.ru
Multithreading function. This can be fun using on friends or family, I don't take any responsabilities of what you're doing with it.
Simply create a "accounts" file with email:password in it separated by new lines, and create "proxies" file with every proxies in it. If you don't want to use proxies simply create a proxies file but put nothing in it. And put the "body", "titles", and "names" files in the folder where the .exe is.
Parse errors to show the real error. Handle way more providers like gmail etc.