Does Mailscanner Rename

Heino Backhaus heino.backhaus at
Fri Mar 27 14:03:20 GMT 2015

Hello All,

I enjoy using mailscanner for many years now. Thanks to all.
I would realy appreciate your help with a problem i was running across.

The first question is. Does Mailscanner rename a file with a CLSID in 
the filename to something like this: CLIP-%7B8EC58011.bmp ?

Now to my problem:
An attached bitmap (a companys logo) triggeres the CLSID Filename rule.

The MailWatch report says:
Report:	MailScanner: Files containing CLSID's are trying to hide their 
real type (CLIP-%7B8EC58011.bmp)

The corresponding rule from filename.rules.conf is stated below:

# Deny filenames containing CLSID's
deny    \{[a-hA-H0-9-]{25,}\}   Filename trying to hide its real type 
                         Files containing  CLSID's are trying to hide 
their real type

A strange thing is that this file downloaded from Mailwatch and attached 
to a new (html) mail will pass the Mailscanner.
So i think it's renamed and may not be the original name...
But when you try to release the mail from quarantine it triggers
the CLSID-Rule again ... I'm a little confused about this and need help.
Thanks in advance.

My Softwareversions are:

MailWatch Version = 1.2.0 - Beta 5

MailScanner Version = 4.84.6

PHP Version = 5.5.9-1ubuntu4.7

MySQL Version = 5.5.41-0ubuntu0.14.04.1


"In retrospect it becomes clear that hindsight is definitely overrated!"

   -Alfred E. Neumann

More information about the MailScanner mailing list