Does appleutd@xmr3.com belong to the Apple up to date program? I applied for the apple up to date program through their site and got now the e-mail with a password protected pdf attachment in it. Xmr3 doesn't really sound like apple. Has anybody some additional info on this?

NOTE: I didn't visit their site because the WOT add-on in safari rated the website with a poor reputation score.
I wonder if you signed up for their Up to Date Program on a web page pretending to be the Apple website. That PDF is most likely a scam, do not open it--It could execute some malicious code. In the last seven years I have yet to see e-mail communication from Apple that does not come from apple.com. Also, I think all of their invoicing is done by using HTML-formatted e-mail messages sent to your Apple ID, not PDF's. Hope this helps.