Postfix only allow whitelisted Recipient Domain

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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 <HuuPV@gmail.com>: Recipient address rejected: Access denied

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