Qmail, Php Mail , Hotmail

I have a vps with a site has phpbb2.

Before one month I migrated to another vps host.

In the old vps, the sending notfications such as reply new topic ( watch ), e-mail activations to new members notifications of the private messages were working very fine and each memeber which has valid e-mail will receiev these notifications from my forum.

The old vps using sendmail.

But the new one using qmail and it is will configured and the e-mail notifications are recieved which means that it is working except the ones who use hotmail accounts begin not recieve anything, the others e-mails are recieved well.

The files are the same, excpet the old uses sendmail, the new vps uses qmail.

After many days of searching how to solve this I decided to contact the support team.

They replied to me that they should do to overcome hotmail receive email problem, reverse PTR record needs to be added and to add SPF records under my domain's DNS zone.

They did and they told me to wait 24 hours, I waited for 4 days and it did not work.

I went back to them and again they look closely to my qmail configurations and it is fine and working and also they made an hotmail account to test and send e-mail form my mail server and it had been accepted which means that my domain and my new IP is not blocked by hotmail.

So their is nothing wrong excpet that email notifications from my phpbb it still won't go to members who have hotmail.

Very strange if the hotmail hates php mail scripts like phpbb why before in the old vps was like, and now suddenly hates.