[otrs] No notification for agents and customers after new ticket and new tickets created by email are not created

Hi all, The agents in our organisation don't get any notifications anymore when a new ticket is created. Another thing that goes wrong is that when a ticket is being created by sending an email, the ticket is not created at all in the OTRS system. Both problems occurred after changing the authentification from DB to LDAP and after changing the passwords of 2 OTRS users in the Active Directory. My guess is that the problem lies on the email (Postmaster) of OTRS, but where can I check the settings and set the new passwords correctly? Met vriendelijke groet / Kind regards / Mit freundlichem Gruß, Erik van Ast