Zimbra Collaboration Suite 7.0
Zimbra Collaboration Suite 7.0
Administrator's Guide
Open Source Edition

Zimbra Directory Service > Internal Authentication Mechanism

Internal Authentication Mechanism
For accounts stored in the OpenLDAP server, the userPassword attribute stores a salted-SHA1 (SSHA) digest of the user’s password. This information is not used to connect to the directory server; it is only used to compare with the information on the OpenLDAP server, using a pool of re-usable administrator LDAP connections.