RTFM before configuring and running Courier!!! Check and/or modify the following configuration files to suit your needs: %%PREFIX%%/etc/courier/authdaemonrc %%PREFIX%%/etc/courier/authldaprc %%PREFIX%%/etc/courier/authmysqlrc %%PREFIX%%/etc/courier/authpgsqlrc %%PREFIX%%/etc/courier/courierd %%PREFIX%%/etc/courier/esmtpd %%PREFIX%%/etc/courier/esmtpd-msa %%PREFIX%%/etc/courier/esmtpd-ssl %%PREFIX%%/etc/courier/faxcoverpage.tr %%PREFIX%%/etc/courier/faxnotifyrc %%PREFIX%%/etc/courier/faxrc %%PREFIX%%/etc/courier/imapd %%PREFIX%%/etc/courier/imapd-ssl %%PREFIX%%/etc/courier/ldapaddressbook %%PREFIX%%/etc/courier/ldapaliasrc %%PREFIX%%/etc/courier/pop3d %%PREFIX%%/etc/courier/pop3d-ssl Note that some of the configuration files might not exist depending on which authentication services you chose to omit. Do not forget to update /etc/pam.conf with the contents of %%PREFIX%%/etc/courier/*.authpam. See /etc/pam.conf(8) for further assistance. Documentation (if installed locally) is located in %%PREFIX%%/share/doc/courier/ otherwise see http://www.Courier-MTA.org/