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-`HELO_HOSTNAME`: **\<empty\>**: Custom hostname for HELO operation.
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-`HOST`: **\<empty\>**: SMTP mail host address and port (example: smtp.gitea.io:587).
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-Using opportunistic TLS via STARTTLS on port 587 is recommended per RFC 6409.
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-As per RFC 8314, if supported, Implicit TLS/SMTPS on port 465 is recommended, otherwise opportunistic TLS via STARTTLS on port 587 should be used.
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-`IS_TLS_ENABLED` : **false** : Forcibly use TLS to connect even if not on a default SMTPS port.
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- Note, if the port ends with `465` SMTPS/SMTP over TLS will be used despite this setting.
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- Note, if the port ends with `465`Implicit TLS/SMTPS/SMTP over TLS will be used despite this setting.
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- Otherwise if `IS_TLS_ENABLED=false` and the server supports `STARTTLS` this will be used. Thus if `STARTTLS` is preferred you should set `IS_TLS_ENABLED=false`.
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-`FROM`: **\<empty\>**: Mail from address, RFC 5322. This can be just an email address, or
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