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The config files that begin with the word "hash" in the parameter, like virtual_alias_maps, /etc/postfix/domains, /etc/postfix/vmailbox are not directly read from by postfix. These have to be processed by 'postmap' so they are made into a hash "lookup table" which is all of the data in your text file made optimized for faster parsing by postfix. Use the command 'postmap' to make a hash AFTER you populate these files with your data. postmap /etc/postfix/virtual postmap /etc/postfix/domains postmap /etc/postfix/vmailbox