Connections are being refused right off the bat.
That's probably not spam control, but serious overloaded servers (so overloaded that they can't respond properly) or other technical issues.
If it is spam control, they are telling your mailserver to try one of the other @hotmail.com mailservers. So you'll try 10 different mailservers, and if all of them are rejecting your E-mail, you'll try those same 10 mailservers again in half an hour. With the default settings, you'll try 960 times to reach their mailservers, resulting in about 115K of TCP overhead -- much more than that spam they were worried about.
However, a test from http://www.DNSreport.com shows that 30% of their mailservers are down (refusing the connections immediately), whereas the other 70% are accepting connections. So in this case, the E-mail is going to get to them anyways, so it isn't spam control that is causing this.
-Scott
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