ZyXEL Communications ZYWALL 35 - And the Email Receiver Already Got a Part of the Contaminated File in Her;His Laptop or Desktop; I03. What Happens When an Email with Large Attachment in Size, E.g 5 MB, Is Downloaded Which Has Virus in It; Scanned by Anti-Virus, IDP and Anti-Spam Feature in Zywall Zynos V4.0

ZyWALL 35 Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
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I02. A customer already has her/his own exchange server including the Anti-Spam
software from other vendors; is there any good reason for her/him to use ZyXEL’s
Anti-Spam service in addition to the current solution?
Yes, the reasons are:
1. Complementary filtering
The tagged-spam filtered by spam software will be tagged again by ZyWALL’s Anti-Spam. But those
undetected spam emails can be detected by ZyWALL’s Anti-Spam feature.
2. Phishing
Not every spam software can detect phishing emails. The Anti-Spam service of ZyWALL can detect
phishing emails.
I03. What happens when an email with large attachment in size, e.g. 5MB, is downloaded
which has virus in it?
ZyWALL’s Anti-Virus feature doesn't care the file size. We have implemented a special algorithm to
handle this condition – file with attachment of any size can be scanned by Anti-Virus feature of ZyWALL
UTM.
I04. What happens if the virus is in the last part of the email message and the email
receiver already got a part of the contaminated file in her/his laptop or desktop?
Even the virus hidden in the last part of a specific file, we still can detect and then destroy this part. As a
result, the user will get a file but it can't be accessed (read, write or execute). Thus, the laptop/desktop
won't be infected by this virus.
I05. Will the traffic coming in through the VPN tunnel also be scanned by Anti-Virus, IDP
and Anti-Spam feature in ZyWALL ZyNOS v4.0?
No, VPN traffic will not be inspected by be scanned by Anti-Virus, IDP and Anti-Spam module.
However, we manage to support this feature in the forthcoming ZyNOS firmware.