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How can I setup postfix to automatically route mail to the correct UNIX user no matter which domain the mail comes in on.
For example, lets say I have 100 domains, and I want all mail that comes to webmaster@[every virtual host in /var/www/*] to end up in my single UNIX user webmasters ~/Maildir
What you need is Postfix' virtual_alias_maps.
Some references:
http://www.electrictoolbox.com/update-postfix-virtual-alias-map/
http://www.postfix.org/VIRTUAL_README.html
Postfix: virtual_alias_maps delivering everything to one user despite new domain
