Based on another thread here, I want to move to using postscreen/postwhite and ditch postgrey.
Just want to make sure I don't bungle stopping postgrey. So... - edit main.cf and remove "check_policy_service inet:127.0.0.1:10023" from smtpd_recipient_restrictions. - restart Postfix - purge the postgrey package. Then go about getting postscreen working. Thanks.