I was wondering if anyone could help with a little issue I have?

I have a BuffaloTech 1Tb NAS drive, where one of the options is to send an email report to myself once the maintenance has completed.  However it requires an IP address from my SMTP mail server which is my Hotmail account.

Does anyone know what the IP address is for the Hotmail SMTP server so my NAS drive can send the emails out?

I have attached a screen shot to make things a little more understandable.