Remove useless method.

Changelog excerpt:
- Removed a useless method (sendEmail, did nothing, used nowhere).

Author: Maikuolan

Changelog.md

@@ -57,3 +57,5 @@ __*Why "v3.0.0" instead of "v1.0.0?"*__ Prior to phpMussel v3, the "phpMussel Co
 [2021.09.09; Bug-fix; Maikuolan]: The front-end signature information page reported the wrong counts for unidentified or other under the signature vendor or source counts; Fixed.
 
 [2021.10.30; Maikuolan]: Code-style cleanup: Public before private properties, magic before public before private methods.
+
+[2021.10.30; Maikuolan]: Removed a useless method (sendEmail, did nothing, used nowhere).

src/FrontEnd.php

@@ -2381,20 +2381,6 @@ private function frontendLogger(string $IPAddr, string $User, string $Message):
         $this->Loader->logRotation($this->Loader->Configuration['frontend']['frontend_log']);
     }
 
-    /**
-     * Wrapper for PHPMailer functionality.
-     *
-     * @param array $Recipients An array of recipients to send to.
-     * @param string $Subject The subject line of the email.
-     * @param string $Body The HTML content of the email.
-     * @param string $AltBody The alternative plain-text content of the email.
-     * @param array $Attachments An optional array of attachments.
-     * @return bool Operation failed (false) or succeeded (true).
-     */
-    private function sendEmail(array $Recipients = [], string $Subject = '', string $Body = '', string $AltBody = '', array $Attachments = []): bool
-    {
-    }
-
     /**
      * Generates very simple 8-digit numbers used for 2FA.
      *