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diff --git a/docs/content/doc/advanced/config-cheat-sheet.en-us.md b/docs/content/doc/advanced/config-cheat-sheet.en-us.md
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--- a/docs/content/doc/advanced/config-cheat-sheet.en-us.md
+++ b/docs/content/doc/advanced/config-cheat-sheet.en-us.md
@@ -606,6 +606,7 @@ Define allowed algorithms and their minimum key length (use -1 to disable a type
- 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`.
- `FROM`: **\<empty\>**: Mail from address, RFC 5322. This can be just an email address, or
the "Name" \<email@example.com\> format.
+- `ENVELOPE_FROM`: **\<empty\>**: Address set as the From address on the SMTP mail envelope. Set to `<>` to send an empty address.
- `USER`: **\<empty\>**: Username of mailing user (usually the sender's e-mail address).
- `PASSWD`: **\<empty\>**: Password of mailing user. Use \`your password\` for quoting if you use special characters in the password.
- Please note: authentication is only supported when the SMTP server communication is encrypted with TLS (this can be via `STARTTLS`) or `HOST=localhost`. See [Email Setup]({{< relref "doc/usage/email-setup.en-us.md" >}}) for more information.