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Postfix only allow whitelisted Recipient Domain

In this tutorial, How to Configure "Postfix only allow whitelisted Recipient Domain". We test environment with user data. To minimize the risk of sending to unwanted email recipients.

Postfix only allow whitelisted Recipient Domain


Step 1: Add line into main.cf file as below
smtpd_recipient_restrictions = check_recipient_access hash:/etc/postfix/recipient_domains, reject
Note: Warring /etc/postfix/recipient_domains, reject , Allow receive email in recipient_domain, and REJECT All domain not in whitelisted domain.


Step 2: To create recipient domain is the whitelist file
mycompany.com OK
mail.huuphan.com OK
Note: only two domain mycompany.com and mail.huuphan.com receive mail

Step 3: To generate hash file:
$ sudo postmap /etc/postfix/recipient_domains

Step 4: To restart postfix service
$ sudo /etc/init.d/postfix restart
Now to try sending an email to a another domain not in whitelist.
You will find error something like that as below:
NOQUEUE: reject: RCPT from …: 554 5.7.1 <[email protected]>: Recipient address rejected: Access denied

Conclusion

Thought the article, To help you configure Postfix server only allow whitelisted domain. You have any question to comment below.

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