[BUGFIX] 1604 Fixed a minor typo

Classes/Controller/MailController.php

@@ -347,7 +347,7 @@ class MailController extends ActionController {
 			if (\count($bccAddresses) > 0) {
 				foreach ($bccAddresses as $bccAddress) {
 					if (!(strpos($bccAddress, '{') !== FALSE
-						&& strpos($ccAddress, '{') < strpos($bccAddress, '}'))
+						&& strpos($bccAddress, '{') < strpos($bccAddress, '}'))
 						&& !filter_var($bccAddress, FILTER_VALIDATE_EMAIL) && trim($bccAddress) !== '') {
 						$message = LocalizationUtility::translate('backend.error_bcc', 'sg_mail');
 						$this->addFlashMessage($message, '', FlashMessage::WARNING);