Speed Send Mailer - From the developer: "Speed Send Mailer is a very fast, powerful yet simple to use bulk email sender. Utilizing multiple threads/connections and multiple SMTP servers your emails will be sent out fast and easily. With 100 connections, its like sending your emails out with 100 computers. Comes with already built in SMTP servers, you can add or delete as many servers as you like. Easy to use interface allows you to see exactly the SMTP servers that are current running or are currently down, the emails that are being sent from which server, ability to randomize your 'from' field or subject line, html or text messages."