Can Ironport handle RAR files?

We're starting to get malicious content embedded in RAR files attached to emails.  This shouldnt be a problem as we have a policy to quarantine any emails with executable attachemnts coming in.
It appears that, although the Ironport recognises the .rar attachement as a compressed container, it is unable to expand it, and so this malicious EXE is getting through.  They have also made it just bigger than 250MB so that it is missed by the CASE and VOF scanner limits.
We're using AsyncOS 7.1.5-017 on a C360.
Steve

Hi Enrico,
btw Mcafee antivirus cant scan RAR files, even a test virus cant stop it, below is an example:
7 Nov 2014 15:00:06 (GMT +02:00)
Message 329833 scanned by Anti-Virus engine McAfee. Interim verdict: CLEAN
27 Nov 2014 15:00:06 (GMT +02:00)
Message 329833 scanned by Anti-Virus engine Sophos. Interim verdict: REPAIRED
27 Nov 2014 15:00:06 (GMT +02:00)
Message 329833 scanned by Anti-Virus engine. Repaired message parts: 'EICAR-AV-Test'
27 Nov 2014 15:00:06 (GMT +02:00)
Message ID 329833 rewritten to new message ID 329834 by antivirus.

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