block attachments by file extension V16
Question asked by Jeff Roberg - August 30, 2017 at 6:33 AM
Answered
How do I set up extension file blocking for attachments?
I am wanting to block .bin .zip .exe etc...

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Derek Curtis Replied
Employee Post Marked As Answer
Hi, Jeff
  1. Log in as the System Admin
  2. Go to the Settings area
  3. Click on General Settings
  4. Look for the Attachments card: here you'll have editable areas for both Incoming Extension Blacklist and Outgoing Extension Blacklist. Click on whichever you want to edit and add your extensions: BIN, ZIP, EXE...one item per line.
  5. Save your changes and you're good to go. 
Derek Curtis
COO
SmarterTools Inc.
(877) 357-6278
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Matthew Leyda Replied
Will this feature be added to Ver 15?
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Jeff Roberg Replied
Thanks Derek for the great instructions
I looked there several times but just wasn't seeing it.
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John Marx Replied
If we choose say .zip to block does it verify it truly is a .zip? I ask as one technique for virus writers and spammers is to use a "legit" extension which in-turn is something malicious. Is it just checking the extension or the actual file type?
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Derek Curtis Replied
Employee Post
John - we block by extension. So if you have a block for .ZIP files, regardless of whether the file type is actually a ZIP or not it will be blocked.
Derek Curtis
COO
SmarterTools Inc.
(877) 357-6278
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John Marx Replied
Thanks. I should have been more clear. We have had users getting .jpg, .jpeg, and .zip that are actually .exe files. A user clicks on them and boom a virus or malware is installed (yes there are people without antivirus or malware protection).

If we block .exe but the extension is not .exe how would we stop these type of instances?
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Derek Curtis Replied
Employee Post
ClamAV *should* detect those. If you can grab a .EML file and send it to us (just send it to sales@) we can test it locally.
Derek Curtis
COO
SmarterTools Inc.
(877) 357-6278

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