The Axigen Mail Server provides Clustering Support. Clustering support is based on OpenLDAP integration with Axigen and allows routing for the SMTP Incoming, POP3 Proxy, IMAP Proxy and WebMail Proxy services. This new feature enables you to spread mailboxes on several Axigen back-end servers and have a separate tier containing multiple front-ends that route POP3/IMAP/WebMail connections to the appropriate back-end server.
Another important feature of the OpenLDAP integration with the Axigen mail server is the LDAP Authentication mechanism. This method is available for all the Axigen services that require authentication: SMTP In, POP3, IMAP, WebMail, POP3 Proxy and IMAP Proxy.
For a detailed example on how to setup a high availability distributed solution see this related article: "Implementing, Deploying and Managing a High Availability Distributed Solution on Axigen Mail Server" available here.
Also, Axigen implements LDAP synchronization. Accounts and groups in a domain can be synchronized with associated LDAP entries. Synchronization is supported for OpenLDAP and ActiveDirectory servers through their LDAP-based synchronization protocol using LDAP cookies (RFC 4533). The synchronization can be done in the following ways:
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from AXIGEN to LDAP: changes on a AXIGEN object (account/group) are propagated upon the associated LDAP entry;
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from LDAP to AXIGEN: changes on a LDAP entry are propagated upon a corresponding AXIGEN object (account/group);
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both ways: changes in one part (LDAP or AXIGEN) are propagated upon the corresponding object in the other part.