Hello, How does it take to configure the SMTP server to reject all mail that does not come from an external server dedicated. Explanation: I would use a proxy server to filter all external MX incoming emails. I'm stuck because I do not know or configure it. Thank you for your help. Sincerely,
Hello, I replied, hoping that this is ok. I modified the file "master.cf"as follows: smtpd_helo_restrictions= permit_mynetworks, warn_if_reject reject_non_fqdn_hostname, reject_invalid_hostname, reject and I add the proxy server name MX section "network" in the file "main.cf" as follows: mynetworks = 127.0.0.0/8 [::1]/128, my_serverproxymx thank you let me know if this is correct. Sincerely,