Hi friends, I'm setting up an MX backup server (Postfix) on Debian Jessie as suggested here. Seem to me to have made all correctly but obviously it is not so because the backup server does not send to the main server :-| Could you help me to understand where I 'm wrong? DNS MX 10 server1.org MX 20 server2.org This i my main.cf, where server1.or is the primary and server2.org is the backup MX : Code: smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) biff = no append_dot_mydomain = no readme_directory = no smtpd_tls_cert_file = /etc/fullchain.pem smtpd_tls_key_file = /etc/privkey.pem smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination smtpd_client_restrictions = reject_unknown_reverse_client_hostname smtpd_recipient_restrictions = reject_non_fqdn_sender, reject_unauth_destination, reject_unknown_reverse_client_hostname, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, reject_unknown_sender_domain, reject_non_fqdn_recipient myhostname = server2.org alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydestination = server2.org, localhost.server2.org, localhost relay_domains = $mydestination, server1.org transport_maps = hash:/etc/postfix/transport relay_recipient_maps = relayhost = mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 maximal_queue_lifetime = 50d mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all smtpd_tls_mandatory_protocols = !SSLv2,!SSLv3 virtual_mailbox_domains = mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf virtual_alias_maps = mysql:/etc/postfix/mysql-virtual-alias-maps.cf,mysql:/etc/postfix/mysql-email2email.cf virtual_transport = lmtp:unix:private/dovecot-lmtp smtpd_sasl_type = dovecot smtpd_sasl_path = private/auth smtpd_sasl_auth_enable = yes smtpd_tls_security_level = may smtpd_tls_auth_only = yes smtpd_milters = unix:/spamass/spamass.sock milter_connect_macros = i j {daemon_name} v {if_name} _ smtpd_sender_login_maps = mysql:/etc/postfix/mysql-email2email.cf,mysql:/etc/postfix/mysql-virtual-alias-maps.cf Many thanks! Davide
