Re: Cannot ban lzh attachment

On 2021-11-30 13:35, Nikolaos Milas wrote:
> Hello,
> 
> On CentOS 8 / amavis 2.12 we are receiving (a significant number of)
> incoming mail, each addressed to a large number of people in our org,
> each with two virus infected attachments: .lzh and .gz extension.

clamav handle this very well if using foxhole 3dr party signatures

so amavis just reject virus

note you may not have rar unpacker installed, or its just fake mime type 
to hide not unpacking, this is propetly known from the malware writer 
that amavisd would not try more

imho best option do change amavisd to not be a virus scanner, but use 
clamav with 3dr party signatures

keywords 0-day signatures, no more surprises