Connect. Communicate. Collaborate. Securely.

Home » Kerio User Forums » Kerio Connect » Rejecting attachment messages
  •  
Matt S

Messages: 230
Karma: 6
Send a private message to this user
We get so many .zip spam messages now that I've blocked .zip files in the attachment filter. These messages are rarely caught by the spam filter or greylisting Sad

This doesn't surprise me because they're usually not full of junk and mainly contain just the attachment with a short, fake explanation of what it is.

The attachment filter prevents the zip payload getting to my users but I'd really like to have the option to reject the messages altogether.

Is there a way to do this?
  •  
Matt S

Messages: 230
Karma: 6
Send a private message to this user
I guess not then. Disappointing.
  •  
freakinvibe

Messages: 1508
Karma: 58
Send a private message to this user
No, this is not possible. But there is another possibility:

Use the built-in Anti-Virus of Kerio. This should catch malicious .zip files and it will discard the message, so the user will not get it. The other advantage with this, users can still receive valid .zip files.


Dexion AG - The Blackberry Specialists in Switzerland
https://dexionag.ch
  •  
Matt S

Messages: 230
Karma: 6
Send a private message to this user
Hmmm... I initially had to switch on blocking of .zip files because they were getting through the anti-virus. The definitions will have moved on, so that may now work... I'll see what happens but would still like more control.
  •  
Macman2013

Messages: 20
Karma: 0
Send a private message to this user
Unfortunately the built in Sophos AV fails to find many payload viruses not least due to the delay in definitions being updated by Sophos / new variants as yet unclassified.

As I see this as quite a security risk we decided the only course of action that seemed possible.

We could not rely on the "do not open an attachment unless you are 100% sure" scenario who can?

We have being using the attachment filter and blocking all .ZIP files however we have added a rule in the attachment filter to allow AKEYWORD/s and character/s prefix to the file name to allow those specific ZIP files through and given all people who need to send them the details.

This has been accepted by all parties and caused a lot less fuss than anticipated we just explained it is for better protection.

  •  
Matt S

Messages: 230
Karma: 6
Send a private message to this user
That's a good idea. Although to be honest blocking zip files has caused us no problems. People are used to using dropbox or google drive to share larger files, they just use these services and send links to anything they would previously have e-mailed.

I'd still much rather reject messages with zip attachments, but there we are.
Previous Topic: Greylist priority - can custom filters take precedence?
Next Topic: Spam filter custom rules odd behaviour
Goto Forum:
  


Disclaimer:
Kerio discussion forums are intended for open communication between forum members and may contain information and material posted by members which may be useful in learning about Kerio products. The discussion forums are not intended to provide technical support for any specific product. Any information implied or expressed in the discussion forums is that of the posting member. Kerio is in no way responsible for the information posted in the forums, or its accuracy. Kerio employees may participate in the discussions, but their postings do not represent an offical position of the company on any issues raised or discussed. Kerio reserves the right to monitor and maintain the forums to promote free and accurate exchange of information.

Current Time: Mon Aug 21 08:20:45 CEST 2017

Total time taken to generate the page: 0.00467 seconds
.:: Contact :: Home ::.
Powered by: FUDforum 3.0.4.