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<div class="moz-cite-prefix">Am 05.03.2015 um 15:55 schrieb Paul:
</div>
<blockquote cite="mid:54F86E7B.2070604@amaltea.de" type="cite">
<pre wrap="">Für den Fall dass Return-Path @dhl.com/.de ist, mag das helfen, aber die
(derzeit 2) Mails, die ich gesichtet habe, kommen bspw von
<a class="moz-txt-link-abbreviated" href="mailto:rosner14@smtp.dragon.cz">rosner14@smtp.dragon.cz</a> über
Received: from smtp.dragon.cz (smtp.dragon.cz [213.168.176.4])
oder
<a class="moz-txt-link-abbreviated" href="mailto:rezsoh@mail.1ahosting.hu">rezsoh@mail.1ahosting.hu</a>
Received: from mail.1ahosting.hu (mail.1ahosting.hu [62.68.162.114])
</pre>
</blockquote>
<br>
Das hast Du falsch verstanden. Die Mails die Du siehst sind mit
höchster Wahrscheinlichkeit Spam.<br>
Ich schicke die korrekt signierten Mails am Spamfilter vorbei,
sodass sie nicht mehr geprüft werden.<br>
Das geht mit DKIM sehr gut. Die echten Mails sind nämlich von
"@dhl.de" und "@dhl.com".<br>
<br>
<br>
<blockquote cite="mid:54F86E7B.2070604@amaltea.de" type="cite">
<pre wrap="">Momentan ist noch der Betreff in einem schlechten Deutsch verfasst und
bei meinen beiden Spammails nahezu identisch. Header-Check oder amavis
Regel schaffen da evtl. Abhilfe.
</pre>
</blockquote>
Ähhm, kann ich nicht nachvollziehen. Die Betreffs sind immer mit
"Paketankündigung" oder "Zustellbenachrichtigung" etc. und einer
Paketnummer.<br>
Da ist kein schlechtes deutsch im Betreff, höchstens im Content.<br>
Die Betreffs variieren sehr stark in der Anordnung, daher ist das
ein mittelgutes Kriterium.<br>
<br>
<br>
<blockquote cite="mid:54F86E7B.2070604@amaltea.de" type="cite">
<pre wrap="">Mich interessiert, wie du das umgesetzte hast.
Kannst du mal grob beschreiben wie, womit du die Prüfung und die
Abweisung machst?
</pre>
</blockquote>
Naja die Prüfung auf korrekt signierte Mails geht mit Amvis
Boardmitteln:<br>
<br>
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<![endif]--><br>
<br>
Danach baust Du mit Spamassassin Regeln zum Blockieren der
Fälschungen. Hier kann man schon harte Regeln bauen,<br>
weil die echten Mails ja niemals den Spamfilter erreichen.<br>
Ich nutze mehrere Regeln zur Sicherheit, das muss aber jeder selbst
entscheiden.<br>
<br>
Eine grobe Regel sieht z.b. so aus.<br>
Wem das zu hart ist, kann sich ja Meta-Regeln bauen, die auch den
Betreff mit einbeziehen.<br>
<br>
header MY_HEADER_104 From =~ /DHL.*<.*>/<br>
describe MY_HEADER_104 gefaelschte DHL-Paketankuendigungen<br>
score MY_HEADER_104 8<br>
<br>
Man kann natürlich das ganze verfeiern.<br>
<br>
Wer kein DKIM prüfen kann, könnte sich auch einer Prüfung des
Return-Paths bedienen,<br>
da dieser schwerer zu fälschen ist, und sowieso nicht bei den
geklauten Accounts (welche das Botnet nutzt) machbar ist.<br>
Der Return-Path der echten Mails lautet <a class="moz-txt-link-abbreviated" href="mailto:paket@dhl.de">paket@dhl.de</a><br>
<br>
Beste Grüße<br>
<br>
Carsten<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
</body>
</html>