How to implement virtual users

Virtual users with passwd-files

• A simple virtual passwd file installation

• Virtual passwd file and Exim

• Virtual passwd file and Postfix

Virtual users with LDAP

• OpenLDAP (Cheat sheet)

• Postfix and Active Directory

System users and/or Virtual users with LDAP

• Dovecot, ManageSieve, Exim, OpenLDAP and getmail (Instructions in German) - LDAP users can be both System Users and Virtual Users depending on how you use LDAP with the possibility to add subaccounts for each user. For example if you have a LDAP user named peter, you can add a separate subordinate mailbox to retrieve mail from an external mail account like peter[at]gmail.com

Virtual users with SQL

• MySQL

  • Dovecot, Postfix with Dovecot LDA transport and Dovecot SASL Auth, Postfix Admin, MySQL and SquirrelMail

  • ISP-style Email Server with Debian-Etch and Postfix (MySQL, Dovecot, Postfix etc.)

• PostgreSQL

  • PostgreSQL and Postfix

  • PostgreSQL, Postfix (Dovecot LMTP and Dovecot SASL), Dovecot and vmm (command line tool)

• SQLite

  • Postfix+Dovecot with SQLite3 backend (also implements system users)