The solution is as follows: smtpd_client_restrictions = check_client_access hash:/etc/postfix/bad_domains
with the format of: sify.net REJECT So far, it hasn't caused any problems. -- "Whenever I feel blue, I start breathing again." - Unknown -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED]?subject=unsubscribe https://listman.redhat.com/mailman/listinfo/redhat-list