I don't think there is any mechanism in clamav-milter or clamd to 
alert/convinct/block attachments scans based on file extension. Perhaps there 
is an option in Sendmail?
​

Micah Snyder (they/them)
ClamAV Development
Talos
Cisco Systems, Inc.

________________________________
From: clamav-users <clamav-users-boun...@lists.clamav.net> on behalf of Marc 
via clamav-users <clamav-users@lists.clamav.net>
Sent: Monday, May 20, 2024 5:00 AM
To: ClamAV users ML <clamav-users@lists.clamav.net>
Cc: Marc <m...@f1-outsourcing.eu>
Subject: Re: [clamav-users] reject/flag files based on extension

>
> Is it possible to configure clamav, so it rejects or marks files as virus
> just based on their file extension?
>

When it processes data from milter. Maybe someone has experience with this? I 
have the impression from these pages that somewhere filenames are available 
within clamav, so I guess rules on extensions should be possible, not?

https://docs.clamav.net/manual/Signatures/FileTypeMagic.html
https://docs.clamav.net/manual/Signatures/PhishSigs.html#wdb-format
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