- http://blog.thecodingmachine.com/content/triggering-php-script-when-your-postfix-server-receives-mail
- http://rudd-o.com/linux-and-free-software/setting-up-a-mail-server-using-postfix-in-5-minutes
- http://www.postfix.org/VIRTUAL_README.html
- http://stackoverflow.com/questions/17468109/postfix-unable-to-find-etc-postfix-virtual-file
- http://www.postfix.org/pipe.8.html
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