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How to reject the attachment which exceed filesize limit in Exchange Server 2007 before it gets received by the HT server
Posted on 2009-05-12
Hi All,
Is there any way to change the precedence of email sending attachment validation ?
because at the moment, a user sent 80 MB email attachment and he got the Forefront error of false positive rather than the "polite" Exchange Server NDR.
any help would be appreciated.
Thanks.
Is there any way to change the precedence of email sending attachment validation ?
because at the moment, a user sent 80 MB email attachment and he got the Forefront error of false positive rather than the "polite" Exchange Server NDR.
any help would be appreciated.
Thanks.
Error Message:
From: ForefrontServerSecurity@ExServer.com [mailto:ForefrontServerSecurity@ExServer.com]
Sent: Wednesday, 13 May 2009 11:37 AM
To: Joe Adams
Cc: mail-admin
Subject: Microsoft Forefront Security for Exchange Server detected a virus
Microsoft Forefront Security for Exchange Server has detected a virus.
Virus name: "Exceedingly compressed size"
File name: "CES_Client_542.zip"
State: Removed
Subject Line: "FW: CES Client 5.4.2"
Sender: "Joe Adams"
Location: "Itree Software/Exchange Administrative Group (FYDIBOHF23SPDLT)/ExServer (Realtime Scan Job\Joe Adams\Outbox)"
Name MaxMessageSize
---- --------------
Send Connector 20000KB
Name MaxMessageSize
---- --------------
Receive Connector 20000KB
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8 Comments
You can configure max send and receive size globally to reject messages above that size.
Configure attacment filtering, if you want to filter on the type of file.
http://technet.microsoft.com/en-us/library/aa997139.aspx
AV scans the email first and then it goes through all the AntiSpam agents in a Hub Transport Server.
Configure attacment filtering, if you want to filter on the type of file.
http://technet.microsoft.com/en-us/library/aa997139.aspx
AV scans the email first and then it goes through all the AntiSpam agents in a Hub Transport Server.
ok, so in this case the AV take precedence over the filesize.
i think it's a bit of waste of CPU resource checking the file attachment which was supposed to be rejected at the HT level before continuing to the Forefront layer.
but thanks anyway for the reply.
i think it's a bit of waste of CPU resource checking the file attachment which was supposed to be rejected at the HT level before continuing to the Forefront layer.
but thanks anyway for the reply.
unfortunately my server has got all of the role:
HT-CAS-MBx + Forefront Security for Exchange 2007 (5 AV Engine)
HT-CAS-MBx + Forefront Security for Exchange 2007 (5 AV Engine)
So, the forefront picks up the virus messages so that Exchange hub doesn't have to go through all anti spam rules.
yes this is not what i want ;-| I'd like to know if it is possible to re-arrange the order of validation.
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