Good Email For Kids?

mgessner writes "My kids are starting to want email accounts of their own. Even though gmail does a pretty good job of filtering spam, it's not perfect. Searching the web the other day for kid-safe email, I found a few sites that say they can do the job. What do others do for their kids' email? Pay for it? Just use a free service like gmail or yahoo? I don't pay for email accounts out of my own pocket, so I don't really see the need, but if the cost was a few bucks a month, I'd do it."