Blat is a Win32 command line utility that sends eMail using SMTP or post to usenet using NNTP.
The official site is http://blat.net. The current version (as of Oct 22 2010) is v2.6.2 and was released Feb 25 2007. The license is located at http://blat.net/?docs/license.txt. Below is a quote from the license.
The authors of Blat have placed it in the public domain. This means you can use it free of charge for any purpose you like, with nearly no conditions being placed on its use by us. The source code is also available free of charge and under the same conditions as the executables.
It was first released in October 1998.