Exchange 2007 and Winmail.dat, why???
We’re using postie on our wordpress to allow our users the ability to email in posts and edit content on our site. Recently I noticed that when I sent images through our exchange server, it was stripping out the images and replacing them with winmail.dat. 5 minutes of searching the internet gave me an answer once again! It seems that certain contacts in your exchange contact list will get data formatted specifically for outlook clients. What causes the exchange server to make this assumption, I haven’t found out yet, but at least I was able to stop it from happening on our exchange server.
Here’s the summary of the solution
“We’ve sorted this out, this happens on domains that doesn’t know how to process winmail.dat.
We’re using Exchange 2007 and it happens only when we send emails to mail contacts on a specific mail domain. What we’ve done is in EMC, go to the properties of the mail contact and on the Genral tab on the “Use MAPI rich text format” option, choose “Never” instead of “use default settings”. That sorted it out!”
The whole original solution can be found here