XF 2.0 All eMail to T-Mobile Spam

All eMail are Spam to T-Mobile. Its same when i forward this eMail with other eMail Account. But this is only be new reply eMail.

I have not change this code and all Style have this problem

HTML:
<!DOCTYPE html>
<html lang="de-DE" dir="LTR">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<base href="https://www.seite.com/">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="format-detection" content="telephone=no">
<title>Neue Antwort im Thema - Talk - Hallo</title>
</head>
<body dir="LTR" leftmargin="0" topmargin="0" marginwidth="0" marginheight="0" style="margin: 0; padding: 0; word-wrap: break-word; -ms-text-size-adjust: 100%; -webkit-text-size-adjust: 100%; background-color: #ececec; font-size: 13px; font-family: BlinkMacSystemFont,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif; line-height: 1.6; color: #141414;">

<table id="bodyTable" border="0" width="100%" height="100%" cellpadding="0" cellspacing="0" style="border-spacing: 0; mso-table-lspace: 0pt; mso-table-rspace: 0pt; border-collapse: collapse; height: 100% !important; width: 100% !important; margin: 0; padding: 0; background-color: #ececec;"><tr>
<td align="center" valign="top" id="bodyTableContainer" style="border-collapse: collapse; background-color: #ececec;">
        <table border="0" width="600" cellpadding="0" cellspacing="0" class="container" dir="LTR" style="border-spacing: 0; mso-table-lspace: 0pt; mso-table-rspace: 0pt; border-collapse: collapse; width: 100%; max-width: 600px;">
<tr>
<td class="header" align="center" valign="top" style="border-collapse: collapse; color: #818e97; padding: 6px 12px; border-top-left-radius: 4px; border-top-right-radius: 4px; font-family: BlinkMacSystemFont,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif; font-size: 22px; line-height: 1.6;">
                <a href="https://www.seite.com/" style="color: #818e97; text-decoration: none;">seite</a>
            </td>
        </tr>
<tr>
<td class="content" align="left" valign="top" style="border-collapse: collapse; background-color: #fefefe; border-radius: 2px; color: #141414; padding: 12px; font-size: 13px; font-family: BlinkMacSystemFont,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif; line-height: 1.6;">

<p style="margin-top: 0;"><a dir="auto" href="https://www.seite.com/members/admin.1/" style="color: #4f5a62; text-decoration: none;">admin</a> antwortet auf ein Thema, welches du im <a href="https://www.seite.com/" style="color: #4f5a62; text-decoration: none;">seite</a> folgst..</p>

<h2 style="font-size: 22px; font-weight: normal; margin: 12px 0; padding: 0;"><a href="https://www.seite.com/posts/3478224/" style="color: #4f5a62; text-decoration: none;">Talk - Bastelstunde am Server</a></h2>




    <table cellpadding="10" cellspacing="0" border="0" width="100%" class="linkBar" style="border-spacing: 0; mso-table-lspace: 0pt; mso-table-rspace: 0pt; border-collapse: collapse; padding: 6px; background-color: #f5f5f5; border-top: 1px solid #d8d8d8;"><tr>
<td style="border-collapse: collapse;">
            <a href="https://www.seite.com/threads/hallo.450758/unread?new=1" class="button" style="color: #f2f3f4; text-decoration: none; display: inline-block; padding: 5px 10px; background-color: #4f5a62; border: none; border-radius: 4px; font-size: 12px;">Thema öffnen</a>
        </td>
        <td align="right" style="border-collapse: collapse;">
            
                <a href="https://www.seite.com/watched/threads" class="buttonFake" style="color: #4f5a62; text-decoration: none; display: inline-block; padding: 5px 10px; font-size: 12px;">Beobachtete Themen</a>
            
        </td>
    </tr></table>
<p class="minorText" style="font-size: 12px; color: #8c8c8c;">Bitte antworte nicht auf diese E-Mail. Du musst das Forum besuchen, um zu antworten.</p>

<p class="minorText" style="font-size: 12px; color: #8c8c8c;">Du bekommst diese E-Mail, weil du das Thema <a href="https://www.seite.com/threads/hallo.450758/" style="color: #8c8c8c; text-decoration: underline;">hallo</a> im seite beobachtest.  Du wirst keine weiteren E-Mails über dieses Thema erhalten, bis du die neuen Nachrichten gelesen hast.</p>

<p class="minorText" style="font-size: 12px; color: #8c8c8c; margin-bottom: 0;">Um diese E-Mails nicht mehr zu bekommen , kannst du <a href="https://www.seite.com/email-stop/1/content?t=thread&amp;id=450758&amp;c=bdf62eb0e66f8dcf21921a8b70cd5ecf" style="color: #8c8c8c; text-decoration: underline;">E-Mails zu diesem Thema deaktivieren</a> oder <a href="https://www.seite.com/email-stop/1/all?c=bdf62eb0e66f8dcf21921a8b70cd5ecf" style="color: #8c8c8c; text-decoration: underline;">alle E-Mails deaktivieren</a>.</p>

            </td>
        </tr>
<tr>
<td class="footer" align="center" valign="top" style="border-collapse: collapse; padding: 6px 12px; text-align: center; color: #8c8c8c; font-size: 12px; font-family: BlinkMacSystemFont,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif; line-height: 1.6;">
                <div><a href="https://www.seite.com/" style="color: #8c8c8c; text-decoration: underline;">Besuch seite</a></div>

                
            </td>
        </tr>
</table>
</td>
</tr></table>
</body>
</html>


The original message was received at Tue, 20 Nov 2018 16:51:11.



----- Error description -----

mx00.t-online.de: Server rejected message.

Server answered: "550-5.7.0 Message considered as spam or virus, rejected

550-5.7.0 Your IP: **

550-5.7.0 Mailhost: mailin83.aul.t-online.de

550-5.7.0 Timestamp: 2018-11-20T16:51:11Z

550-5.7.0 Expurgate-ID:

149288::1542732671-000013BB-82044697/10/27569915916

550-5.7.0 Authenticator:

BBA950CD1D4DBAFC1747611DCD3814158E819C2AE1C9A21793580B01E23BB84361A22ACE

550-5.7.0

550-5.7.0 Your message has been rejected due to spam or virus classification.

550-5.7.0 If you feel this is inapplicable, please report the above error codes

550-5.7.0 back to FPR@RX.T-ONLINE.DE to help us fix possible misclassification.

550-5.7.0 We apologize for any inconvenience and thank you for your assistance!

550-5.7.0

550-5.7.0 Die Annahme Ihrer Nachricht wurde abgelehnt, da sie als Spam oder

550-5.7.0 Virus eingestuft wurde. Sollten Sie dies als unzutreffend ansehen,

550-5.7.0 senden Sie bitte obige Fehlercodes an FPR@RX.T-ONLINE.DE, damit wir

550-5.7.0 die Klassifizierung untersuchen koennen. Wir entschuldigen uns fuer

550 5.7.0 etwaige Unannehmlichkeiten und bedanken uns fuer Ihre Unterstuetzung!"
 
There are a lot of variables surrounding mail delivery. In this case, it certainly sounds like it may be a false positive in their classification. The detailed error message you provided includes instructions on how to deal with that.
 
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