It is also necessary to enable NTLM (SPA) authentication in email clients. These settings are generally performed in user's email account configuration. The following section provides instructions on how to set for example MS Outlook extended by the Kerio Outlook Connector:
In the menu, select View or change existing e-mail accounts.
Select a Kerio (MAPI) account and click on (see figure 28.4 Editing an e-mail account).
In the account settings just opened, go to the Account tab and enable the Secure Password Authentication option (see figure 28.5 NTLM authentication settings).
