We have a client who regularly forwards emails to one of our internal users that contains html attachments, which allows us to read and download secure messages. The internal main user who does this suddenly is receiving an email with an unnamed attachment, but if I save the attachment as an html file, I can open it, the web page redirects properly to the secure web page, and we can access the file securely. If this email is forwarded to another user, of even if the internal user who is having the problem forwards the email to another user, there is an html attachment. When the other user forwards the email back, the email then has an attachment with an html extension. I am unable to figure out why the emails are not showing up properly from the original source only, so any ideas would be appreciated.

This is for Outlook 2010, and I've tried to disable all plugins in Outlook, I've gone into Internet Options in the control panel and deleted browsing history, restored advanced settings, reset IE settings, and tried versions of IE9, 10, 11 on the system. Nothing helped. The system is protected with Vipre antivirus and Malwarebytes, and I've disabled/enabled these during troubleshooting.

Thank you.

• Edited by baskervi Wednesday, February 18, 2015 7:34 PM

Hi,

Let's test to let the user send the email on OWA, check if the problem persists.

Regards,

Melon Chen
TechNet Community Support

Can this issue be reproduced? Does it occur only with html attachment or is it with any attachment? 

You can check to see if .html files are being blocked by outlook. 

Open up the registry editor (Start > type: regedt32 > Enter)

Navigate to the following key

HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Security

Look for "Level1Remove".

Right-click > Modify > Review the list of extensions being blocked.

If you see ".html;" there, remove it and try again.

John

Also - check in Internet Advanced Settings to see if the option for "Do not save encrypted files to disk" is enabled.

If so, disable it.

Great idea! I'll track down the URL and try it through a browser today. This isn't Exchange - just Outlook with POP3/SMTP. 

Other emails with HTML seem to be OK, and as far as I can tell, other attachment types function OK. This user receives secure emails from at least a handful of other clients, but this is the only one she's having problems with. This email is sent through McAfee secure email service, and having dealt with enough McAfee systems in the past, I'd presume she'd have a problem with any secure emails coming from McAfee.

Another great idea. I'll be by the office today and set this. I'll post whatever results I can find. Thanks

This key doesn't exist. As a matter of fact, I searched through the entire registry, and I didn't get a single hit. Thanks for the input, though.

There is an option for "Do not save encrypted pages to disk", but it's already unchecked.

Webmail works fine, so it's definitely a problem with Outlook.

Forwarding the email through webmail and retrieving it with Outlook works - I can see the html attachment in Outlook this way.

I had hoped that deleting her domain profile on the computer and recreating it with a new Outlook profile would solve the problem, but it still exists. It's some global problem with the computer. The emails we need are coming from a limited number of domains, so I'm going to set up a fowarding rules that emails coming in from that domain will be resent to this user. Convoluted, but maybe it will work. Thanks for your help.

Apologies, I believe this should be the key.

HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\14.0\Outlook\Security

I missed this post previously. I'll try that shortly. Thanks

Sorry, but html isn't in this.