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Check Recipients 1.0.0rc.001318 Requires Restart
Checks the existence of email addresses of all recipients in Compose message window from local address books and LDAP directories.
About this Add-on
This feature is based on LDAP settings for address autocompletion (global or account-specific).
It can be used with Multi-LDAP add-on in order to check several directories simultaneously.
Multi-LDAP add-on: https://addons.mozilla.org/firefox/addon/5684