Hi I'm Hernan, I'm mail administrator of ELSERVER.COM, we are having some issues with a reception of hotmail's accounts. Our clients sent us email from "@hotmail.com" account and they don't receive it, or, they receive very delayed, typically by about 12 hours.
We had verified our filters and restriction policies and didn't found any problem.
We check a mail's headers and we figured out that a delay was produced in your servers, if you need a headers i could provide these.

We keep in touch

Best Regards