Ruby-based open source software for mass email sending.
With bulkmail, all you need is a content file and a recipients file - simply add the content you want to send and the addresses you want to send to, and let bulkmail do the rest. The program will send each email by connecting directly to each recipient's SMTP server, which means you don't have to worry about configuring your own SMTP server.
It's worth noting that bulkmail uses pNet-DNS for making DNS queries. While the current version of pNet-DNS may throw out a few warnings, these can safely be ignored.
Finally, it's worth mentioning that bulkmail is licensed under the terms of the MIT/X Consortium License. This means that you can use, modify, and distribute the program as you see fit, so long as you follow the terms of the license. Overall, if you need a reliable, easy-to-use bulk mailing solution, bulkmail is definitely worth checking out.
Version 0.3.0: N/A