Is there a known issue with hotmail and xenforo? How can fix this?
I've tried setting the -f parameter, changing smtp settings, and making sure that the email domain name from the site that I'm sending it from. The only other issue could be that i'm using a shared VPS host and have a shared IP address. I'm guessing that has something to do with it. I used the AOL Postmaster test to determine that I have a reverse IP. Whatever that means.