| services.postfix.settings.main.relayhost | List of hosts to use for relaying outbound mail.
Putting the hostname in angled brackets, e.g. [relay.example.com], turns off MX and SRV lookups for the hostname.
https://www.postfix.org/postconf.5.html#relayhost
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| services.postfix.settings.main.myhostname | The internet hostname of this mail system
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| services.postfix.settings.main.mynetworks | List of trusted remote SMTP clients, that are allowed to relay mail
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| services.postfix.settings.main.smtp_tls_CAfile | File containing CA certificates of root CAs trusted to sign either remote SMTP server certificates or intermediate CA certificates
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| services.postfix.settings.main.relay_domains | List of domains delivered via the relay transport.
https://www.postfix.org/postconf.5.html#relay_domains
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| services.postfix.settings.main.mydestination | List of domain names intended for local delivery using /etc/passwd and /etc/aliases.
Do not include virtual domains in this list.
https://www.postfix.org/postconf.5.html#mydestination
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| services.postfix.settings.main.mynetworks_style | The method used for generating the default value for mynetworks, if that option is unset.
https://www.postfix.org/postconf.5.html#mynetworks_style
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| services.postfix.settings.main.message_size_limit | Maximum size of an email message in bytes.
https://www.postfix.org/postconf.5.html#message_size_limit
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| services.postfix.settings.main.recipient_delimiter | Set of characters used as the delimiters for address extensions
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| services.postfix.settings.main.smtpd_tls_chain_files | List of paths to the server private keys and certificates.
The order of items matters and a private key must always be followed by the corresponding certificate.
https://www.postfix.org/postconf.5.html#smtpd_tls_chain_files
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| services.postfix.settings.main.smtp_tls_security_level | The client TLS security level.
Use dane with a local DNSSEC validating DNS resolver enabled.
https://www.postfix.org/postconf.5.html#smtp_tls_security_level
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| services.postfix.settings.main.smtpd_tls_security_level | The server TLS security level
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