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,
 

 編輯建立限制檔案：

~etc/postfix/local_domains
# 限制可以接收的指定域
~etc/postfix/local_senders
# 限制指定使用者傳送到 指定的域
~/etc/postfix/local_recipients
# 限制 指定使用者接收 指定域的郵件

postmap 載入生產 db 資料：

# postmap hash:/etc/postfix/local_domains
# postmap hash:/etc/postfix/local_recipients
# postmap hash:/etc/postfix/local_senders

重啟 postfix

如此便能可以只接收 local_domains 指定的域下的郵件了