>and last checks the hashes

No, this is the first check after decompressing. If assp finds a hash it 
does not know if the file is good or bad (because this should not matter). 
If a good hash is found, it exceptional stops processing the attachment.

>ALLOWPARTONLY

What should happen, if for example two good hashes are found - one with 
and one without this tag? First with tag - second wihout ..... first 
without - second with? Different in different compression levels, Same in 
... but different elsewhere ... to be continued endless.

The code logic for the sequence how attachment are decompressed and 
analyzed is fixed - there is no need to change it. This feature is (as I 
wrote) an exceptional additional check (quick and simple like it should 
be).

Anything like 'ALLOWPARTONLY' will raise  the complexity of the code and 
the configuration to an expotentional level. And if I think about anyone 
requests extensions like: INOFFICEONLY, IGNOREINOLE, INDOCONLY, INXLSONLY 
.... (to be continued infinity) - because he/she is unable to aggree to 
the required level of trust - I am getting dizzy.

The concept to build and to implement this feature is over a year old. I 
had to put in to the dev pipeline because of the templating feature in 
UserAttach. Some code may be changed - but not the concept (keep existing 
features, keep the procesing sequence, keep exceptional handling of 
exceptions).

If you are unable to trust you partners, you need to build your own trust 
level - but assp is not the right application to do such things.

To build your own trust level, use any of the leading behavior/thread 
analyzers like:

Cisco Advanced Malware Protection Virtual Private Cloud Appliance
trendmicro Deep Discovery Analyzer
checkpoint advanced threat protection
windows defender advanced threat protection

depending on the required performance they are from ~50.000 to ~120.000 
$US (checkpoint offers also some cheaper solutions, if less performance is 
required)

or you spend some days or weeks to build and to configure your own "cuckoo 
sandbox" envirionment (for free)

Thomas

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