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| — | linux:postfix_as_relay [2019/10/31 08:55] (current) – created - external edit 127.0.0.1 | ||
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| + | ====== Postfix: external backup SMTP ====== | ||
| + | Edit transport.cf and specify what to transport where, and what to discard | ||
| + | <code bash |transport.cf> | ||
| + | example.com smtp: | ||
| + | example2.com smtp: | ||
| + | example3.com smtp: | ||
| + | * discard: | ||
| + | </ | ||
| + | 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=/ | ||
| + | smtpd_tls_key_file=/ | ||
| + | smtpd_use_tls=yes | ||
| + | smtpd_tls_session_cache_database = btree: | ||
| + | smtp_tls_session_cache_database = btree: | ||
| + | |||
| + | |||
| + | smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination | ||
| + | myhostname = mail.example.com | ||
| + | alias_maps = hash:/ | ||
| + | alias_database = hash:/ | ||
| + | mydestination = $myhostname, | ||
| + | relayhost = | ||
| + | mynetworks = 127.0.0.0/8 [:: | ||
| + | mailbox_size_limit = 0 | ||
| + | recipient_delimiter = + | ||
| + | inet_interfaces = all | ||
| + | inet_protocols = all | ||
| + | default_transport = discard: | ||
| + | relay_domains = example.com, | ||
| + | maximal_queue_lifetime = 5d | ||
| + | maximal_backoff_time = 2h | ||
| + | minimal_backoff_time = 15m | ||
| + | queue_run_delay = 15m | ||
| + | </ | ||