Better antivirus (AV) protection?

[Nikolaos Milas]

Hello,

We have amavisd-new v2.12.1 in service with ClamAV v0.103.4 (on Rocky 
Linux 8.5) together with additional unofficial signatures from 
eXtremeSHOK (ref.: https://github.com/extremeshok/clamav-unofficial-sigs)

Yet, we are recently receiving a lot of mails with virus-infected 
attachments (usually in 7z files) which are scanned by amavis/clamav but 
are NOT getting detected.

Obviously, our current setup does not provide sufficient protection.

Based on your experiences with similar setups, can you please suggest 
additional ways to provide high (or at least better) AV protection?

Thanks in advance,
Nick