mail日志中可以看到有些无效的域名邮件可以直接丢弃
5305 example.com[93.184.216.119]:25: Connection timed out 1265 mail.qq.co[50.23.198.74]:25: Connection refused 394 Host not found, try again 374 qqq.com[98.126.157.163]:25: Connection refused设置check_recipient_access访问表 在smtpd_recipient_restrictions参数中增加check_recipient_access hash:/etc/postfix/recipient_access 例:
smtpd_recipient_restrictions = check_recipient_access hash:/etc/postfix/recipient_access,permit_mynetworks,permit_sasl_authenticated,reject_invalid_hostname,reject_non_fqdn_hostname,reject_unknown_sender_domain,reject_non_fqdn_sender,reject_non_fqdn_recipient,reject_unknown_recipient_domain,reject_unauth_pipelining,reject_unauth_destination/etc/postfix/recipient_access内容为：
[email protected] REJECT #具体地址 example.com REJECT #对整个域实现访问控制postmap /etc/postfix/recipient_acces 之后执行 postfix reload
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