Since yesterday I have noticed that messages are getting queued when trying to send mail to hotmail.com, messages to all other domains are sent fine. I can successfully do a telnet communication test from my gateway to hotmail and but in the end it says "Message Queued for delivery", and I can telnet to port 25 to the mx records for hotmail - this indicates all is fine from my end in terms of DNS. the eventually get to hotmail successfully but it takes a very long time i.e 5-6 hours at least. we have reverse dns setup already to ensure we are not being treated as spam mailers. anyone having similar problem. ?