Exchange: Mail attachments are turning to winmail.dat
This is a very common issue but I just wanted to highlight the component which supposed to be changed here.
The issue is when one messaging system user is sending an attachment it is becoming winmail.dat. I recently got this issue in mail flow between IBM Lotus notes Domino to Microsoft Exchange 2010.
Here are the steps to fix it
- Login to your exchange server
- Open Exchange management Console
- Go to Organization Configuration à Hub Transport
- Select “Remote Domain” tab
- Go to the properties of the Default Domain
- Select “Message Format” tab
-
Now you can see the problem is “Determine by individual user setting”
-
Change “Exchange rich-text format” to “Never use” like the screen below
- Click Apply then ok.
- Restart Microsoft Exchange Transport server on every Hub transport server.
This should fix winmail.dat issue.
Prabhat Nigam
Microsoft MVP | Exchange Server
Team@MSExchangeGuru
October 10th, 2013 at 3:40 pm
Hello,
Thanks for this article.
I have this problem last week in Exchange 2013.
I cannot found this menu in ECP2013.
Do you know if there is a power shell command ?
Thanks.
October 10th, 2013 at 3:45 pm
@Anexus
2013 has in the shell. Below is the cmd. Dont forget to restart Transport service.
Get-remoteDomain | set-remoteDomain -TNEFEnabled $False
October 10th, 2013 at 3:49 pm
Many Thanks.
I’ll try it tomorrow morning.
October 17th, 2013 at 3:50 am
[…] Exchange: Mail attachments are turning to winmail.dat […]
August 1st, 2014 at 5:08 am
I already have this option disabled, and some users are still sending mail and it is appearing as winmail.dat, any ideas how this is possible?
August 1st, 2014 at 9:37 am
Check if they are using rich text format in their outlook and the issue is only with outlook.
you might need to update outlook or exchange server. What is you outlook and exchange level?
November 5th, 2014 at 5:35 am
This worked for me with Exchange 2010 & Outlook 2013.. No more winmail.dat attachments.. Thanks…