From the clothing ads that dance around in epileptic flashes to the constant requests for your credit card number, email service from the German website GMX.net has some shortcomings. You can get 1 GB of memory, but you'll need a credit card for anything more -- a 5 GB allowance runs about $4.50 per month, and for 10 GB, you pay about $7.50 per month. That may seem steep, but it'd be even pricier if not for the enormous dating-site banners seducing clicks between visits to the in-box. In its defense, GMX.net does have a customer service line. And it only costs about $2.60 per minute.