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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		|  | @ -627,7 +627,8 @@ SUBJECT_PREFIX = | |||
| ; Mail server | ||||
| ; Gmail: smtp.gmail.com:587 | ||||
| ; QQ: smtp.qq.com:465 | ||||
| ; Note, if the port ends with "465", SMTPS will be used. Using STARTTLS on port 587 is recommended per RFC 6409. If the server supports STARTTLS it will always be used. | ||||
| ; Using STARTTLS on port 587 is recommended per RFC 6409.  | ||||
| ; Note, if the port ends with "465", SMTPS will be used.  | ||||
| HOST = | ||||
| ; Disable HELO operation when hostnames are different. | ||||
| DISABLE_HELO = | ||||
|  | @ -639,11 +640,13 @@ SKIP_VERIFY = | |||
| USE_CERTIFICATE = false | ||||
| CERT_FILE = custom/mailer/cert.pem | ||||
| KEY_FILE = custom/mailer/key.pem | ||||
| ; Should SMTP connection use TLS | ||||
| ; Should SMTP connect with TLS, (if port ends with 465 TLS will always be used.) | ||||
| ; If this is false but STARTTLS is supported the connection will be upgraded to TLS opportunistically. | ||||
| IS_TLS_ENABLED = false | ||||
| ; Mail from address, RFC 5322. This can be just an email address, or the `"Name" <email@example.com>` format | ||||
| FROM = | ||||
| ; Mailer user name and password | ||||
| ; Please Note: Authentication is only supported when the SMTP server communication is encrypted with TLS (this can be via STARTTLS) or `HOST=localhost`. | ||||
| USER = | ||||
| ; Use PASSWD = `your password` for quoting if you use special characters in the password. | ||||
| PASSWD = | ||||
|  |  | |||
|  | @ -397,10 +397,15 @@ set name for unique queues. Individual queues will default to | |||
| - `DISABLE_HELO`: **\<empty\>**: Disable HELO operation. | ||||
| - `HELO_HOSTNAME`: **\<empty\>**: Custom hostname for HELO operation. | ||||
| - `HOST`: **\<empty\>**: SMTP mail host address and port (example: smtp.gitea.io:587). | ||||
|   - Using opportunistic TLS via STARTTLS on port 587 is recommended per RFC 6409. | ||||
| - `IS_TLS_ENABLED` :  **false** : Forcibly use TLS to connect even if not on a default SMTPS port.  | ||||
|   - Note, if the port ends with `465` SMTPS/SMTP over TLS will be used despite this setting. | ||||
|   - 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. | ||||
| - `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. | ||||
| - `SKIP_VERIFY`: **\<empty\>**: Do not verify the self-signed certificates. | ||||
|    - **Note:** Gitea only supports SMTP with STARTTLS. | ||||
| - `SUBJECT_PREFIX`: **\<empty\>**: Prefix to be placed before e-mail subject lines. | ||||
|  | @ -415,7 +420,6 @@ set name for unique queues. Individual queues will default to | |||
| - `SENDMAIL_PATH`: **sendmail**: The location of sendmail on the operating system (can be | ||||
|    command or full path). | ||||
| - `SENDMAIL_TIMEOUT`: **5m**: default timeout for sending email through sendmail | ||||
| - ``IS_TLS_ENABLED`` :  **false** : Decide if SMTP connections should use TLS. | ||||
| 
 | ||||
| ## Cache (`cache`) | ||||
| 
 | ||||
|  |  | |||
|  | @ -46,6 +46,12 @@ PASSWD         = `password` | |||
| 
 | ||||
| For the full list of options check the [Config Cheat Sheet]({{< relref "doc/advanced/config-cheat-sheet.en-us.md" >}}) | ||||
| 
 | ||||
| - Please note: authentication is only supported when the SMTP server communication is encrypted with TLS or `HOST=localhost`. TLS encryption can be through: | ||||
|   - Via the server supporting TLS through STARTTLS - usually provided on port 587. (Also known as Opportunistic TLS.) | ||||
|   - SMTPS connection (SMTP over transport layer security) via the default port 465.  | ||||
|   - Forced SMTPS connection with `IS_TLS_ENABLED=true`. (These are both known as Implicit TLS.) | ||||
| - This is due to protections imposed by the Go internal libraries against STRIPTLS attacks. | ||||
| 
 | ||||
| ### Gmail | ||||
| 
 | ||||
| The following configuration should work with GMail's SMTP server: | ||||
|  |  | |||
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