Nice article inc, walk-through by TJ Luoma on using msmtp, a free tool to send email from Terminal on OS X.

“It completely eliminates the need to store your Gmail password in a plain text file on your computer. msmtp uses the Mac OS X Keychain instead.

Although configuring msmtp took about 30 minutes, it was well worth it, and now that you have these handy instructions, it should take you even less time”

Full article: http://www.tuaw.com/2010/05/04/msmtp-a-free-tool-to-send-email-from-terminal/

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