blat!

sendEmail is a lightweight, command line SMTP email client. If you have the need to send email from a command line, this free program is perfect: simple to use and feature rich. It was designed to be used in bash scripts, batch files, Perl programs and web sites, but is quite adaptable and will likely meet your requirements. SendEmail is written in Perl and is unique in that it requires NO MODULES. It has an intuitive and flexible set of command-line options, making it very easy to learn and use. »

SSMTP is a program which delivers email from a local computer to a configured mailhost (mailhub). It is not a mail server (like feature-rich mail server sendmail) and does not receive mail, expand aliases or manage a queue. One of its primary uses is for forwarding automated email (like system alerts) off your machine and to an external email address.

CMail is a command line mailer, originally developed for testing mail server software, but is simple enough to use interactively. CMail supports IPv6, TLS/SSL, authentication, multiple message body and attachment encoding methods, and mail delivery via proxies.

Own SMTP Server is a SMTP server for Windows that lets you send email messages directly from your system. It's very simple but very useful you can use it instead of ISP's SMTP server to increase your security and privacy. OwnSMTP Server supports all email programs lthe email program you already use for sending and receiving messages can be connected to the server in a very easy way by using "localhost" instead of your current SMTP host. Own SMTP Server is very fast, while sending, it establishes dozens of SMTP connections, and gets the most out of your Internet connection. The web interface of the program is very easy and a work in progress. The program is freeware forever so you can download it and try it if you desire! »