Hi there

Thanks for this HOWTO, it was very informative.  I picked up a problem, however.  In this section:

smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination,check_policy_service unix:private/policy

The entry check_policy_service unix:private/policy causes Postfix to generate the following error:

postfix/smtpd[2815]: warning: problem talking to server private/policy: Connection timed out

This may be due to policyd-weight not being installed.  Deleting this entry from main.cf resolves the issue (or presumably installing policyd-weight will solve the issue too, however, since policyd-weight is no longer being maintained, I don't think I will go for this option.)

 Regards