outlook blocked access to the following potentially unsafe attachment

[Antelope]

I receive this message when I send a *.cer file internally in my domain. Where is the setting to make this a safe attachment in Exchange 2003?

 

[xmsre]

*.cer? It has nothing to do with outlook or exchange. That's a Windows XP SP2 specific enhancement called the attachment manager. You can search for it on:

support.microsoft.com

 

[asktheman]

In the Tools Options menu in outlook under security you can untick this so that outlook allows all attachments. This happens even if your attachment was sent internally and has say a .exe or .bat extention...

This is part of office 2003 and not installed as part of Windows xp service pack 2. fact....

 

[xmsre]

http://support.microsoft.com/default.aspx?scid=kb;en-us;555001

Nope, .cer is not on that list. .cer is neither level1 nor level2. It's not Outlook. It's windows XP SP2 attachment manager where .cer is defined as a "high-risk file type".

http://support.microsoft.com/default.aspx?scid=kb;en-us;883260

fact.

 

[Antelope]

Actually, I get the same message when I sent it to an internal user who is using a Windows 2000 workstation with Outlook 2000 on it as well.

It looks like there is an administrative pack with a security template file that I might have to apply to my exchange server in order for this to work. I'll still looking into it.

http://office.microsoft.com/en-us/assistance/HA011402911033.aspx

 

[Antelope]

OK, I found the solution. Download the Outlk10.adm and put this in your group policy. In the tools > options > security folder, Allow access to email attachments and add the CER extension to that list.