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== authenticate users against unix system accounts ==== authenticate users against virtual (non-unix system) accounts ==== hybrid of unix system accounts and virtual users ==Dovecot supports defining multiple authentication databases, so that if the password doesn't match in the first database, it checks the next one. This can be useful if you want to easily support having both local system users in /etc/passwd and virtual users. * source: [http://wiki2.dovecot.org/Authentication/MultipleDatabases Authentication/MultipleDatabases - Dovecot Wiki]