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I have a functioning Active Directory server, but whenever I try to authenticate against the Postfix server that uses it (with saslauthd) I notice that only the bind user can connect. Whenever I try to connect to the server with valid credentials, it does not work.

Any idea as to where I can debug why only the bind user can log in? I know it's possible, because I have another setup with Postfix authenticating against LDAP with all users, but I cannot seem to figure out what the difference is between those.

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Shortly after posting this question, I found the answer myself.

The problem was that my ldap_search_base had the bind user cn=postfix in /etc/saslauthd.conf. After changing the search base to the Users OU, it started to work :)

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