edit or update in Postfix main.cf. For Centos, Redhat and Fedora it's will be in /etc/postfix
#-- start of setting
smtpd_recipient_restrictions =
reject_unauth_destination,
reject_invalid_hostname,
reject_non_fqdn_hostname,
reject_non_fqdn_sender,
reject_non_fqdn_recipient,
reject_unknown_sender_domain,
reject_unknown_recipient_domain,
reject_unknown_recipient_domain,
reject_unauth_pipelining,
reject_non_fqdn_recipient,
check_policy_service inet:127.0.0.1:2501
smtpd_helo_required = yes
#--- end of setting
The setting for check_policy_service inet:127.0.0.1:2501 is for Sqlgrey that can be refer here.
http://sqlgrey.sourceforge.net/
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