Dynamailer - From the developer: "Dynamailer is a 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. You can add or delete as many servers as you like. The 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 real everything of email, html or text messages." Note: In the trial version, you can only use 5 threads for deliveries and send out up to 1000 e-mails.