How to Prevent Winmail.dat Attachments from Being Sent in Outlook
Friday, March 09, 2012
Do recipients of your emails, seemingly out of the blue, complain about a mysterious attachment called "winmail.dat" (of the even more mysterious content type "application/ms-tnef"), which they cannot open, no matter what they try? Do files you attach disappear in that winmail.dat moloch? Does winmail.dat show up for some but not all recipients of your messages?
Check this article out on how to prevent it when sending messages through Outlook through our SMTP Relay Service: http://email.about.com/od/outlooktips/qt/Prevent_Winmail_dat_Attachments_from_Being_Sent_in_Outlook.htm
Also, this article is helpful for users that do not have luck with the above link