I have just noticed that if I try to register in my forum using a hotmail account, the confirmation email never gets delivered to my inbox.
I am using default email transport method with enabled "Set return path with -f parameter".
Then out of curiosity, I tried to send a very simple email using php mail() function from the server, and still no email gets delivered to hotmail addresses (gmail/yahoo works fine).
Upon searching, I have found numerous results in google citing issues with hotmail delivery.
Have you guys faced the similar issue?