__IMPORTANT NOTE__: Thunderbird won\'t show contacts in LDAP address book directly, but it works when you starting typing email address in recipient field while composing email.
*`Name`: use whatever name you like. e.g. Global LDAP Address Book.
*`Hostname`: IP address or hostname of your iRedMail server.
*`Base DN`: Base dn of your domain in LDAP directory. Normally, it's `domainName=domain.ltd,o=domains,dc=xxx,dc=xxx`. For example, `domainName=example.com,o=domains,dc=iredmail,dc=org`.
*`Port Number`: 389. __Note__: If you prefer to connect to OpenLDAP server over SSL, please check the `Use secure connection (SSL)` under same tab.
*`Bind DN`: It's full LDAP dn of your mail account. Normally, it's `mail=user@domain.ltd,ou=Users,domainName=domain.ltd,o=domains,dc=xxx,dc=xxx`. For example: `mail=john@example.com,ou=Users,domainName=example.com,o=domains,dc=iredmail,dc=org`.
*`Don't return more than xxx results`: depends on how many accounts stored in same domain, you may want to increase or descrease it. Default value in 100.
* Now switch to tab `Offline`, click button `Download Now` to test your settings. It will prompt to input password for this LDAP server, just type password of your mail account. With correct bind dn and password, it will display `Replicated succeeded`.