Vinay Sajip avatar Vinay Sajip committed 42f40f5

Closes #12667: Corrected documentation for SMTPHandler secure argument.

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    port, use the (host, port) tuple format for the *mailhost* argument. If you
    use a string, the standard SMTP port is used. If your SMTP server requires
    authentication, you can specify a (username, password) tuple for the
-   *credentials* argument. If *secure* is True, then the handler will attempt
-   to use TLS for the email transmission.
+   *credentials* argument.
+   To specify the use of a secure protocol (TLS), pass in a tuple to the
+   *secure* argument. This will only be used when authentication credentials are
+   supplied. The tuple should be either an empty tuple, or a single-value tuple
+   with the name of a keyfile, or a 2-value tuple with the names of the keyfile
+   and certificate file. (This tuple is passed to the
+   :meth:`smtplib.SMTP.starttls` method.)
    .. versionchanged:: 2.6
       *credentials* was added.
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