The program will send mail at the rate of over 1, 000 e-mails per minute. It has the ability to auto select fastest smtp server.CrazySendMail support multi-threads. CrazySendMail support multi-smtp servers. CrazySendMail offers an easy-to-use interface. CrazySendMail is an software easy to mass emailings. you can send a message to any number of recipients very quickly by using an unlimited number of SMTP servers at once. It features a built-in message editor, an integral address list manager, and support for multiple mailing lists. You can add simple email address lists from .txt files.