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安裝 SPF:

1. /usr/ports/mail/postfix-policyd-spf-perl

2. 修改/usr/local/etc/postfix/master.cf

spf-policy   unix  -       n       n       -       0       spawn
  user=nobody argv=/usr/local/sbin/postfix-policyd-spf-perl

3. 修改 /usr/local/etc/postfix/main.cf

spf-policy_time_limit = 3600
smtpd_recipient_restrictions =
                                    .......,
                                    check_policy_service unix:private/spf-policy,
                                    permit

NOTE:增加在reject_unauth_destination 之後

4. 增加DNS TXT Record

your.domian.     IN      TXT     "v=spf1 ip4:yourserverip -all"