CentOS 8.x postfix block incoming emails from domain or address

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CentOS 8.x postfix block incoming emails from domain or address

To block incoming emails from sender or domain in postfix use:

1. Use following in main.cf

   smtpd_relay_restrictions = permit_mynetworks,
   permit_sasl_authenticated,
   check_sender_access hash:/etc/postfix/access,
   reject_unauth_destination

2. Use following in /etc/postfix/access

   user@domain.com     REJECT

3. Recreate access index:

   postmap access

4. One time reload of postfix for accounting for main.cf changes:

   systemctl reload postfix

Refer:

• https://serverfault.com/questions/534174/how-do-i-block-an-email-address-in-postfix

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