Show pageOld revisionsBacklinksExport to PDFBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ====== Postfix: external backup SMTP ====== Edit transport.cf and specify what to transport where, and what to discard <code bash |transport.cf> example.com smtp:[185.15.28.201]:25 example2.com smtp:[185.15.28.201]:25 example3.com smtp:[185.15.28.201]:25 * discard: </code> Edit main.cf and enter relay domains <code bash |main.cf> smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no append_dot_mydomain = no delay_warning_time = 1h readme_directory = no compatibility_level = 2 # TLS parameters - provide a valid certificate smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination myhostname = mail.example.com alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases mydestination = $myhostname, tertiary, localhost.localdomain, , localhost relayhost = mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all inet_protocols = all default_transport = discard:Outgoing email disabled on this node relay_domains = example.com, example2.com, example3.com maximal_queue_lifetime = 5d maximal_backoff_time = 2h minimal_backoff_time = 15m queue_run_delay = 15m </code> linux/postfix_as_relay.txt Last modified: 2019/10/31 08:55by 127.0.0.1