Adriel via Postfix-users: > If users are added in main MX, how can they be synchronized to backup MX > for relay access?
Use Postfix recipient addres verification. https://www.postfix.org/ADDRESS_VERIFICATION_README.html#recipient This populates a valid recipient address cache on the remote MX. Doing this makes sense if your list of valid addresses changes a often. Otherwise just use a static list. For this to work, both local and remote MX should have the same MX preference, with the remote MX having a transport_maps setting that routes your domain to the local MX. Both MXes should have the same anti-spam policy. On the remote MX: /etc/postfix/main.cf: smtpd_recipient_restrictions = permit_mynetworks # reject_unauth_destination is not needed here if the mail # relay policy is specified under smtpd_relay_restrictions # (available with Postfix 2.10 and later). reject_unauth_destination ... reject_unverified_recipient ... # Privacy feature. # unverified_recipient_reject_reason = Address lookup failed # Forward this domain to the local MX. The [] are required. relay_domains = example.com transport_maps = inline:{ { example.com = relay:[local-mx.example.com] }} The tricky part is the "same anti-spam policy" part. Wietse _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
