>Is it sam that attaches a file named "winmail.dat" to your emails?!

No, though this has been discussed here before.  It's a result of the fact that my e-mail is hosted on an Exchange server.
winmail.dat gets generated to pass formatting data between OWA (which I use) and Outlook.  It unfortunately cannot be turned off, even through the server admin tools.

I am aware of it, and greatly appreciate the other list members tolerating it.

-Ben