How to block external email from domains or individual email

วิธีการตั้งค่าให้ระบบ ZIMBRA ทำการ reject email จากภายนอกไม่ให้สามารถส่งเข้าไปยัง user ภายในระบบได้ หรือการทำ blacklist email สามารถทำตามขั้นตอนได้ดังนี้

1. ตั้งค่า smtpd_sender_restrictions ดังตัวอย่างด้านล่าง

ZIMBRA 7:
รันคำสั่ง

ZIMBRA 8.0:
เพิ่ม “client_sender_access hash:/opt/zimbra/postfix/conf/postfix_reject_sender” เข้าไปยังไฟล์ /opt/zimbra/conf/zmconfigd/smtpd_sender_restrictions.cf

ZIMBRA 8.5 และ 8.6:
แก้ไขไฟล์ /opt/zimbra/conf/zmconfigd/smtpd_sender_restrictions.cf โดยเพิ่มข้อความด้านล่างไปที่บรรทัดที่ 2

และรันคำสั่ง

2. สร้างไฟล์ /opt/zimbra/postfix/conf/postfix_reject_sender โดยที่ภายในไฟล์มีลิสต์ของ email หรือ domain ที่ต้องการจะ block แล้วตามด้วย REJECT ดังตัวอย่าง

3. รันคำสั่ง postmap เพื่อสร้าง database และ restart postfix

** เราสามารถใช้ Amavis ทำ blacklist แทนได้

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