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virtual_mailbox_base = /var/spool/vmail virtual_mailbox_base = /var/vmailThe 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== conclusion ==There are many guides on how to do this, with different structures in the files and locations, or even how the virtual user tables and mailbox are made distinct. If you become familiar with how it works, then you can customize it to fit your system schema. If you find any errors on this page, please create a wiki account and correct them.These are the best references and related guides as of 2014 for postmap/dovecot virtual user configuration.