Need a simple SMTP server...

[lmegliol]

I normally run an SMTP server on a system other than my web server, but that system is down right now.

I'd like to find an SMTP server that I can install on my web server that comes as close as possible to the following:

• Easily installed and uninstalled (portage will probably take care of this)
  
• Not resource intensive
  
• Comes configured as secure as possible right away. I only need to be able to send from localhost.
  
• Easy for me to figure out any other configurations quickly.
  

I'll only need this for a week, so I don't want to invest too much time into it. I have no desire to change all of my programs to use some other method to send email.

Any suggestions?

[timeBandit]

Postfix (emerge mail-mta/postfix). For those requirements, you can probably set it up in a few hours.
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