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Attachments were corrupted when uisng POP3

Network Sharing , TCP/IP, Internet, Wireless, Exchange, IIS, ISA and Print

Attachments were corrupted when uisng POP3

Postby chicagotech » Fri Oct 17, 2008 5:12 pm

When external clients downloaded emails
with attachments through POP3, the attachments were corrupted. Meanwhile,
if checking attachments in OWA, it worked properly.

According to my experience, similar issues could occur if the attachments
were changed/modified by antivirus program or mail scan application when
downloading through POP3. We may need to spend some time on troubleshooting
so as to get the root cause. I would appreciate your kindly patience.

At this point, I'd like to suggest trying the following steps to check if
the issue can be fixed:

1. Verify if the issue occurs to all external POP3 clients or just certain
ones. For a test, could you log on the mailbox via POP3 internally, does
the issue still occur?

2. Verify if the issue occurs to all kinds of attachments or just certain
ones.

3. I have performed a similar test in our environment and the attachment
could be downloaded properly via POP3. I am suspecting the issue was caused
by conflicting services.

a. If you have mail scan application installed in your environment,
temporarily disable the mail scan feature.

b. Meanwhile, make sure that we exclude the following locations on your
Exchange server from being scanned by any file-level antivirus software:

C:\Program Files\Microsoft\Exchange Server

Meanwhile, on the Exchange 2007 server, navigate to the following registry
entry

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\VirusScan

Set the value to the following:

o Value name: Enable
o Value Type: REG_DWORD
o Value Data: 0

Note: The VirusScan registry entry indicates you are using a VAPI antivirus
scanner. This registry key does not exist if a VAPI scanner is not
installed.

Restart the Information Store service.

- Many thanks for your response, the customer disabled the anti-virus software
and the problem ceased to present itself. We're now investigating disabling
particular features of the Anti-Virus software in order to permantently
resolve the problem.
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chicagotech
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