Questions on allowed file types

[Alex via amavis-users]

Hi,

For the longest time we've been permitting ZIP files but rejecting RAR
files due to the frequency of viruses and malicious code being
transmitted through this file type, as well as the general lack of
familiarity users have with the RAR format.

It seems like it's now the case that it's more prevalent, and there
aren't as many that are being rejected.

I was just wondering what the general consensus was on whether you
permit RAR files through your amavisd system or do you still block
them along with EXE and COM files?

Are they still frequently used as virus vectors, or do you feel
confident enough in your virus scanner to catch any malicious code or
viruses that might be contained in the RAR files reliably?

Thanks,
Alex