main.cf 配置示例：
smtpd_restriction_classes = local_in_only, local_out_only local_in_only = check_recipient_access hash:/etc/postfix/local_domains, reject local_out_only = check_sender_access hash:/etc/postfix/local_domains, reject smtpd_recipient_restrictions = check_sender_access hash:/etc/postfix/local_senders, check_recipient_access hash:/etc/postfix/local_recipients, permit_accept_domain permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_hostname, reject_non_fqdn_sender, reject_non_fqdn_recipient, reject_unauth_destination, reject_unauth_pipelining, reject_invalid_hostname reject_rhsbl_sender, reject_unknown_sender_domain,
编辑创建限制文件：
~etc/postfix/local_domains
# 限制可以接收的指定域 ~etc/postfix/local_senders
# 限制指定用户发送到 指定的域 ~/etc/postfix/local_recipients
# 限制 指定用户接收 指定域的邮件
postmap 加载生产 db 数据：
# postmap hash:/etc/postfix/local_domains # postmap hash:/etc/postfix/local_recipients # postmap hash:/etc/postfix/local_senders
重启 postfix
如此便能可以只接收 local_domains 指定的域下的邮件了
原文：https://www.cnblogs.com/sharesdk/p/10222263.html