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@@ -295,13 +295,10 @@ class Mail {
                 try {
 
                     // 没有收件人
-                    if(!empty($header['To'])){
-                        $header['To'] = MailFun::toOrFrom($header['To']);
-                    }else{
-                        $header['To'] = [];
-                    }
+                    $header['To'] = MailFun::toOrFrom($header['To']??($header['TO']??''));
+
 
-                    $header['From'] = MailFun::toOrFrom($header['From']??'');
+                    $header['From'] = MailFun::toOrFrom($header['From']??($header['FROM']??''));
                     // 抄送 ，密送
                     $cc = [];
                     $bcc = [];