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The service is not enabled by default. Enable it by doing the following:
1. Add the following to /etc/postfix/master.cf:
spf-policy unix - n n - 0 spawn
user=nobody argv=%%PREFIX%%/libexec/postfix-policyd-spf-perl
The user nobody is fine if you have no other daemons running as nobody.
Otherwise, you should use a dedicated user and group for this policy
service.
2. Add "spf-policy_time_limit = 3600" to main.cf.
3. Configure the Postfix policy service in %%PREFIX%%/etc/postfix/main.cf:
smtpd_recipient_restrictions =
...
reject_unauth_destination
...
check_policy_service unix:private/spf-policy
...
NOTE: Specify check_policy_service AFTER reject_unauth_destination or your
system may become an open relay.
4. Restart Postfix.
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