[SASAG] Spam/AV Filtering

Jeff Silverman jeffsilverm at gmail.com
Fri Sep 25 21:54:17 PDT 2009

eric at kahklen.com wrote:
> We currently use a spam/av appliance at our gateway.  In addition, we also
> check for attachment types and only allow certain types such as .doc, .pdf,
> .xls....  At times, legitimate types such as zip files are blocked and
> unfortunately there is no way to "whitelist" the sender with certain file
> types so that they can get through to the end users mailbox.  In the past,
> senders have renamed their attachment with a .txt file type.  Although this
> is a convienent solution for the end user, it seems like an easy way to
> circumvent the idea of attachment checking in the first place.  Do most
> people still block attachment types? or do they rely on their AV scanning
> software to quarantine/delete viruses and malware?
> Thanks,
> Eric  
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F5 Networks sells a software/hardware solution called Mail Security 
Module (MSM), which filters E-mail based on the reputation of the 
sending IP address.  Is that something you are interested in investigating?


Jeff Silverman
Linux sysadmin

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