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== tables ==* /etc/passwd - user accounts on the unix system* /etc/aliases - defines aliases for unix accounts on the system. by default these accept mail for any domain on the system. distribution to multiple recipients can be done.* sendmail/virtualusertable - here aliases on specific domains can be defined to be forwarded to a unix mailbox, a distribution list defined in /etc/aliases, and email accounts on other mail systems. On a postfix system the table can also be used to forward email to virtual user mailboxes.* postfix/vmailbox - maps virtual non-unix users to the path of their virtual mailbox* dovecot/virtualpasswd - by any naming convention, this represents the file that contains all virtual users and their passwords. Often the name of the virtual user file is based on the domain of the virtual user's login, /etc/auth/yourdomain.com/passwdThere may also be tables for other things such as a table for the domains hosted on the system if they are not specified directly within one of the postfix configuration files. See [[Dovecot and Postfix Hybrid Authentication Example]] for a list of tables with example entries in the correct format.== final destination ==On a modern mail server using a secure model, unix accounts on the system may not be the final destination for Internet email. If the system is a mail server only, there may be only a small handful of actual unix accounts. Virtual users all have a username which includes the domain name of their primary email address. They are not limited to receiving only mail from the domain in their username, however, it is considered the name of their mailbox, the final destination for Internet mail.