Postfix Kerberos Authentication with Active Directory

This post is meant to be my build doc for configuring the Postfix smtpd to authenticate smtp clients using Cyrus SASL with the Kerberos (GSSAPI) mechanism against Active Directory on a CentOS 6 installation using packages from the distribution. I’m not an expert on this subject. This is from my experience using a lot of reading, trial, and error to get the necessary parts working together.

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