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winmail.dat replaces attachment

I'm having a problem that I am at a loss with.

System: Windows 7 64-bit, Outlook 2007, Barracuda Spam & Virus Firewall 300.

When a user attempts to send an encrypted message with an attachment, the recipient receives the message but the attachment has been replaced by winmail.dat. I've tryed multiple "solutions" that haven't worked.

Including:

Now the weird thing: I have another user that has the same setup but their messages come through just fine and the attachment is correct. ( I have made sure the settings in Outlook are the same between the two machines).

The way they are sending the encrypted message is this. They create the message and uses the Barracuda Outlook plugin (just puts a button there to click and marks the message for encryption) to mark the email for encryption. They click send and the message hits our mail server which in turn sends the message to the Barracuda that encrypts the message and then sends it to cyberspace. Our mail server is MDaemon v.13.6.0

Any clues or definitive answers on how to fix this problem?
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fnbtech
Asked:
fnbtech
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1 Solution
 
Randy DownsOWNERCommented:
Try the fix-it on this page - http://support.microsoft.com/kb/958012/en-us

This problem occurs when the software that the recipient is using does not support certain message formats or certain features that are included in the email message.
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fnbtechAuthor Commented:
Also I just found this out. This only happens when the user encrypts the message they are sending.
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fnbtechAuthor Commented:
This fixed it for me so I'm going to test with other users.

Thank you sir!
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fnbtechAuthor Commented:
This didn't fix the other people but fixed mine.......
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Randy DownsOWNERCommented:
Maybe this will help.

Send Microsoft Exchange Rich Text and set it to Never:

Open the Internet Mail Connector-Properties page.
Click the General-tab.
The Send Microsoft Exchange Rich Text list box controls the sending of rich-text data.
Set this value to Never.
If you don't have control over your Exchange server you could try the following:

You need to add the recipient to you address book.
There you should be able to clear the checkbox for
Always Send To This Recipient In Microsoft Exchange Rich-Text Format
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fnbtechAuthor Commented:
We don't use Microsoft Exchange.
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Randy DownsOWNERCommented:
Try this in Outlook & select plain text.

Change the message format for all messages you send
Click the File tab.
Click Options.
Click Mail.
Under Compose messages, in the Compose messages in this format list, click HTML, Rich Text, or Plain Text.
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fnbtechAuthor Commented:
That has already been tried per the 1st paragraph that I wrote.
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Randy DownsOWNERCommented:
OK not sure why it would work for you but not the others. Permissions issues?
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fnbtechAuthor Commented:
No they have full admin rights to the local disk.
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Randy DownsOWNERCommented:
Try another account on that machine. If it works you could re-create the problem account.
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fnbtechAuthor Commented:
Didn't work.
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Randy DownsOWNERCommented:
What's different about these machines?
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fnbtechAuthor Commented:
Not sure

Both Windows 7 Pro 64-bit
Both Office 2007
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Randy DownsOWNERCommented:
Same as yours which is now fixed, right?
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fnbtechAuthor Commented:
Yea that is the weird part.
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Randy DownsOWNERCommented:
Mostly the solutions I find are related to RTF. Either sending in html or plain text should fix those and we discussed plain text. Have you also tried html? Likewise changing Outlook preferences for a Contact was in the original article you quoted so I assume you have removed any preferences to use RTF for a contact.

The basic problem is that your firewall can't interpret RTF properly. You could try whitelisting some recipients to see if that helps.
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Randy DownsOWNERCommented:
You can also try deleting a contact to see if that helps.
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