I've migrated to a new centos 7 server, and mail is flowing, but i'm getting a bunch of spam and it seems greylist is not working as well... now the greylist daemon is running: 61768 ? Ss 0:00 /usr/sbin/postgrey --unix=/var/spool/postfix/postgrey/socket --pidfile=/var/run/postgrey.pid --group=postgrey --user=postgrey --greylist-text=Greylisted for %s seconds --daemonize --delay=6 but I see NO 'Greylisting in effect' messages in maillog (and there were these on the old server). conclusion its not talking to postfix or amavis... postfix main.cf: --snip-- broken_sasl_auth_clients = yes smtpd_sasl_authenticated_header = yes smtpd_restriction_classes = greylisting greylisting = check_policy_service inet:127.0.0.1:10023 smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_invalid_hostname, reject_non_fqdn_hostname, reject_unknown_recipient_domain, reject_non_fqdn_recipient, reject_unauth_destination, reject_non_fqdn_sender, reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_rbl_client cbl.abuseat.org,reject_rbl_client dul.dnsbl.sorbs.net,reject_rbl_client ix.dnsbl.manitu.net, reject_rbl_client b.barracudacentral.org, check_recipient_access mysql:/etc/postfix/mysql-virtual_recipient.cf, reject_unauth_destination smtpd_use_tls = yes smtpd_tls_security_level = may --snip-- but it seems clearly that greylisting is not being used at all. how can I check to see if the socket is working? and in another tutorial it said to add check_policy_service unix:/var/spool/postfix/postgrey/socket to the end of the smtpd_recipient restrictions - which I've done and am experimenting currently! any thoughts? cdb.