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<div class="moz-cite-prefix">On 16/06/2025 21:41, Martin Kellermann
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:ffef5effe9974f28a6e87ca67c667ddf@sk-datentechnik.com">
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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"
style="mso-fareast-language:EN-US">It could be a
password-protected zip attachment that prevents the virus
scanner from opening and scanning the contents…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"
style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"
style="mso-fareast-language:EN-US">regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"
style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"
style="mso-fareast-language:EN-US">MK</span></p>
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</blockquote>
<p>Thanks for the info.<br>
</p>
<p>I've managed to work it out by taking a copy of one of the
problematic messages and progressively simplifying it and testing.
What I've found is that the problem is triggered by having a
multi-part message, where one or more parts contains multiple
Content-Transfer-Encoding headers...<br>
</p>
<p>I've attached two files. If you compare them you'll see that the
only difference between good.txt and bad.txt, is that bad.txt has
an extra Content-Transfer-Encoding header within the first part of
the multi-part message.<br>
</p>
<p>If you want to replicate my test, please run the following
command on the server with Amavis, but replace <a class="moz-txt-link-abbreviated" href="mailto:user@example.com">user@example.com</a>
with your own email address:</p>
<pre>sendmail <a class="moz-txt-link-abbreviated" href="mailto:user@example.com">user@example.com</a> < bad.txt
</pre>
<p>You should find bad.txt arrives with a subject of
"***UNCHECKED*** Testing" (whereas good.txt has the unmodified
subject of "Testing").</p>
<p>Is this a bug that should be fixed in Amavis? Or ClamAV? Or is it
expected that having an extra header like this makes the message
invalid and therefore shouldn't be virus scanned?<br>
</p>
<p>Thanks,<br>
</p>
<p>Nick.</p>
<p></p>
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