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@@ -254,7 +254,7 @@ class Mail {
                                 $header['To'] = [];
                             }
 
-                            $header['From'] = MailFun::toOrFrom($header['From']);
+                            $header['From'] = MailFun::toOrFrom($header['From']??'');
                             // 抄送 ，密送
                             $cc = [];
                             $bcc = [];