I run a networking/community website (think Myspace), and our invitation emails (a user inputs their hotmail, gmail etc username and password, invites are then sent to all their contacts) are being caught by Hotmail's junk mail folder.
I will be picking someone to work on this, past experience must be shown with knowledge of the task ahead.
We have tried several methods, message edits, header changes and SPF but nothing seems to let us through the filter. After checking, our domain name/IP is not blacklisted.
If you have any questions, please just ask.