HRoth - 1:06 pm on Mar 18, 2010 (gmt 0)
I'm with akmac. I don't call on declines. Most of the time they are declined because the perosn made an error in keeping track of their money, and the last thing they want is some stranger asking them about it. Also, I would not block any hotmail address or ask them to verify email. I would not like that as a shopper and would think they were just wanting to be sure it was a spammable address. If you get a delivery failure on an order, that's already a headsup, but in my experience, even delivery failures are almost always because the person put a period after .com or some simple typo.
It's important to be cautious about fraud, but excessive caution can lead to diminishing returns.