Ok, Walter, es tut mir leid!
Hier ist der Header des "Deliver Status Notification"-Mails vonBluewin:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta name\="format-detection" content\="address=no" />
<meta name\="format-detection" content\="telephone=no" />
<meta name\="format-detection" content\="email=no" />
<meta http-equiv\="X-UA-Compatible" content\="IE=10" />
<meta http-equiv\="Content-Script-Type" content\="text/javascript; charset=utf-8" />
<link rel\="icon" href\="[/cp/img/swisscom/core/favicon.ico](view-source:https://rich-v01.bluewin.ch/cp/img/swisscom/core/favicon.ico)" type\="image/x-icon" />
<link rel\="shortcut icon" href\="[/cp/img/swisscom/core/favicon.ico](view-source:https://rich-v01.bluewin.ch/cp/img/swisscom/core/favicon.ico)" type\="image/x-icon" />
<script type\="text/javascript"> var resource = document.createElement('script');
resource.src="https://widget-lib.mycloud.ch/lib/mycloud-widget.min.js";
resource.id = 'mycloudcorejs';
var script = document.getElementsByTagName('script')\[0\];
script.parentNode.insertBefore(resource, script);
</script\>
Ich kann daraus nichts ersehen, ich kenne mich mit Mail-Headers nicht aus.
Grüsse