Specific emails ID only receive mail from specific domains:





Step 1. At first edit the main.cf file of postfix.

# vim /etc/postfix/main.cf

smtpd_recipient_restrictions = check_recipient_access hash:/etc/postfix/protected_destinations, permit_mynetworks, reject_unauth_destination

smtpd_restriction_classes = insiders_only

insiders_only = check_sender_access hash:/etc/postfix/insiders, reject

[Explanation: smtpd_recipient_restrictions is a postfix parameter, It will check the recipient access by "protected_destinations"- Lets see below what I will put in "protected_destinations"? ]


Step 2. Edit and save the following in

# vim /etc/postfix/protected_destinations

    xyz@domain.com   insiders_only
    

[How do postfix knows insider_only?? It has been declared in main.cf with "smtpd_restriction_classes" after that I defined the "insiders_only" in postfix by "/etc/postfix/insiders".]


Step 3. Now input /etc/postfix/insiders

# /etc/postfix/insiders

   domain.com                      OK       ###matches my.domain and subdomains
   anotherdomain.com        OK       ###matches another.domain and subdomains


Step 4. Now create .db for new files with following commands.

# postmap /etc/postfix/insiders
# postmap /etc/postfix/protected_destinations


Step 5. Restart the postfix service.

# /etc/init.d/postfix restart






Now mentioned Mail ID  cannot received any mail from mentioned Domain   :)

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