Exchange 2010 Server running on Server 2008 R2
Outlook 2010 Client running on Win XP Pro SP3
We send and receive mail for multiple domains (DOMAIN1.com & DOMAIN2.COM)
When the user sends an email from her Outlook using the DOMAIN1.COM account to my external email account (earthlink) with an attachment, it gets changed to a winmail.dat file.
When she sends the same file from her Outlook using the DOMAIN2.COM account, I receive it in tact, just like I should.
WHAT I HAVE TESTED
Changed the Outlook setting from HTML to Plain Text, did not change the result.
We do have A/V scanning on our firewall, but if it was affecting attachments it would cause a problem no matter which account they were being sent from.
I await some help...