Exchange 2010 - Blocked attachments in OWA

Posted on 2012-09-06
Medium Priority
Last Modified: 2012-09-06
I am finding attachments of the type .dtd are being blocked when viewing messages in OWA 2010  (in Outlook 2010 they display OK). They are design school software files.

I think I need to use the Set-AttachmentFilterListConfig but this command is not recognised. Maybe it needs the edge transport role on my server to be installed. I dont know if that role is installed.

so 2 questions:
How can I tell if edge transport role is installed
How can I unblock this attachment type?

Any specific powerhsell command would be grategully accepted!
Question by:Pete
  • 4
  • 2
LVL 10

Expert Comment

ID: 38371603
If they are coming through in Outlook 2010, then it is not an Exchange thing as such.

Check out the registry keys listed in this article and look for the .dtd file:-


Post back here is this is not clear or you need more specific instructions.
LVL 10

Expert Comment

ID: 38371609
P.S. This would need to be on your CAS server (which is the server that hosts OWA).
LVL 10

Accepted Solution

scriven_j earned 2000 total points
ID: 38371651
Sorry - I have just checked and that key no longer appears in Exchange 2010.

Have a look at this related question:-


It includes the powershell.
Creating Active Directory Users from a Text File

If your organization has a need to mass-create AD user accounts, watch this video to see how its done without the need for scripting or other unnecessary complexities.


Author Comment

ID: 38371656
I only have a single Exchange 2010 server.

The reg key below dos not exist


doing a search in the entire registry for 'Level1FileTypes' show no results.
LVL 10

Expert Comment

ID: 38371659
Our posts crossed.  That key is no longer used in Exchange 2010.  Please see the link in my previous comment.

Author Closing Comment

ID: 38371695
awesome works a treat, thanks.

Featured Post

Free learning courses: Active Directory Deep Dive

Get a firm grasp on your IT environment when you learn Active Directory best practices with Veeam! Watch all, or choose any amount, of this three-part webinar series to improve your skills. From the basics to virtualization and backup, we got you covered.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The main intent of this article is to make you aware of ‘Exchange fail to mount’ error, its effects, causes, and solution.
Here in this article, you will get a step by step guidance on how to restore an Exchange database to a recovery database. Get a brief on Recovery Database and how it can be used to restore Exchange database in this section!
To show how to generate a certificate request in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Servers >> Certificates…
Whether it be Exchange Server Crash Issues, Dirty Shutdown Errors or Failed to mount error, Stellar Phoenix Mailbox Exchange Recovery has always got your back. With the help of its easy to understand user interface and 3 simple steps recovery proced…
Suggested Courses

850 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question