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1. To make use of postgrey in postfix, edit postfix configuration file:
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/etc/postfix/main.cf:
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smtpd_recipient_restrictions = ...
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check_policy_service unix:postgrey/socket, ...
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Or if TCP sockets (modify IP / port if needed) is preferred, first change
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POSTGREY_TYPE:
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/etc/sysconfig/postgrey:
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POSTGREY_TYPE="--inet=127.0.0.1:10023"
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then modify postfix configuration file:
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/etc/postfix/main.cf:
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smtpd_recipient_restrictions = ...
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check_policy_service inet:127.0.0.1:10023, ...
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After above steps, please restart the postfix service to make sure postfix has
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loaded the changes. And don't forget to activate the service on startup!
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2. If --privacy option is passed to postgrey in /etc/sysconfig/postgrey, make
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sure perl(Digest::SHA) is installed, using dnf to install if not available:
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dnf install perl\(Digest::SHA\)
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Don't forget to escape the parentheses if other perl modules are absent.
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3. Postgrey could be used with exim if you want, but need to modify the
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systemd service file like removing the dependency of postfix.service. More
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details in README.exim underneath /usr/share/doc/postgrey.
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