首先建立了一個/etc/postfix/reject_user, 填入要封鎖的帳號資料, 建立該db檔.
然後編輯 vi /etc/postfix/main.cf, 並將加入check_sender_access hash:/etc/postfix/reject_user在下面兩項敘述中
smtpd_recipient_restrictions = check_sender_access hash:/etc/postfix/reject_user permit_mynetworks permit_sasl_authenticated reject_rbl_client cbl.abuseat.org reject_rbl_client list.dsbl.org reject_rbl_client sbl.spamhaus.org reject_rbl_client pbl.spamhaus.org reject_rbl_client bl.spamcop.net reject_rbl_client cblless.anti-spam.org.cn reject_rbl_client psbl.surriel.com reject_rbl_client bl.spamcop.net reject_unknown_sender_domain reject_unknown_recipient_domain reject_unauth_destination reject_invalid_hostname reject_non_fqdn_hostname reject_non_fqdn_sender, reject_non_fqdn_recipient,
smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/reject_user, permit_mynetworks, reject_unknown_client, reject_unknown_sender_domain, reject_invalid_hostname, reject_non_fqdn_hostname, reject_non_fqdn_sender
要加入封鎖寄信功能帳號的步驟入下(以postfix系統為例; sendmail應該無法適用)：
1. #用vi指令編輯/etc/postfix/reject_user
[root@mail1 ~]# vi /etc/postfix/reject_user
#填入以下資料, 例如預計要封鎖寄信的帳號user@test.com.tw 跟 user2@test.com.tw
user@test.com.tw REJECT
user2@test.com.tw REJECT
#編輯完成後, 按esc退出編輯模式, Ctrl+wq存檔離開/etc/postfix/reject_user.
2. #建立map db檔
[root@mail1 ~]# postmap hash:/etc/postfix/reject_user
#如果填入資料正確, 上面指令不會出現任何錯誤訊息
3. #重新啟動postfix
[root@mail1 ~]# /etc/init.d/postfix restart
正在關閉 postfix: [ 確定 ]
正在啟動 postfix: [ 確定 ]
這樣user@test.com.tw 跟 user2@test.com.tw就無法寄信, 會被系統直接退信; 但別人寄給他的mail全部都可以收.
將REJECT改成DISCARD, 則是會直接丟棄mail.
im5481 