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Add warning to mailer documentation about authentication (#11563)
* Add warning to mailer documentation about authentication References #7966 Signed-off-by: Andrew Thornton <art27@cantab.net> * As per @guillep2k and @mrsdizzie * as per @mrsdizzie Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: guillep2k <18600385+guillep2k@users.noreply.github.com>
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@@ -46,6 +46,12 @@ PASSWD = `password`
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For the full list of options check the [Config Cheat Sheet]({{< relref "doc/advanced/config-cheat-sheet.en-us.md" >}})
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- Please note: authentication is only supported when the SMTP server communication is encrypted with TLS or `HOST=localhost`. TLS encryption can be through:
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- Via the server supporting TLS through STARTTLS - usually provided on port 587. (Also known as Opportunistic TLS.)
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- SMTPS connection (SMTP over transport layer security) via the default port 465.
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- Forced SMTPS connection with `IS_TLS_ENABLED=true`. (These are both known as Implicit TLS.)
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- This is due to protections imposed by the Go internal libraries against STRIPTLS attacks.
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### Gmail
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The following configuration should work with GMail's SMTP server:
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