Scanning inside zip files

Martin.Hepworth martinh at
Thu Oct 30 17:49:04 GMT 2008

Yeah there's this page about overloading that I put on the wiki..

(spot you used to be a progammer)

Martin Hepworth
Snr Systems Administrator
Solid State Logic
Tel: +44 (0)1865 842300

> -----Original Message-----
> From: mailscanner-bounces at
> [mailto:mailscanner-bounces at] On Behalf
> Of Kevin Miller
> Sent: 30 October 2008 17:33
> To: MailScanner discussion
> Subject: RE: Scanning inside zip files
> Paul Welsh wrote:
> > Apologies if this has been covered many times previously
> but I used to
> > set the maximum depth for zip file scanning to 0, ie, disable it.
> > This allowed files that would otherwise be blocked to be zipped and
> > sent.
> >
> > Then recently came the malware in zip files that changed so
> frequently
> > that Clam and others couldn't keep up so I changed my zip scanning
> > setting to block these viruses.
> >
> > Now I'm getting problems from customers who want to send
> programs in
> > zip files so I've had to reset the maximum depth to 0 again.
> >
> > Off the top of my head I can only think that I should turn on the
> > quarantine (it's off at present) and go back to blocking
> programs in
> > zip files, then dig out files that get blocked in error from the
> > quarantine as requested.
> >
> > Anyone else doing something more clever?
> Can't say that it's particularly clever on my part, but our
> clever leader Julian made it pretty easy to set up a
> whitelist of domains allowed to send restricted content.
> Default behavior is to block, exceptions allowed to pass.
> This is simple if you only have a couple of exceptions.  If
> you're talking dozens on a random basis it isn't quite so handy...
> ...Kevin
> --
> Kevin Miller                Registered Linux User No: 307357
> CBJ MIS Dept.               Network Systems Admin., Mail Admin.
> 155 South Seward Street     ph: (907) 586-0242
> Juneau, Alaska 99801        fax: (907 586-4500
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