Everyone once in awhile I see a connection on Network Shield to dns://7.0.0.223.lbl7.mailshell.net
I never saw this before I upgraded from Pro to IS.
Apparently. See:
http://www.mailshell.com/mail/client/oem2.html/step/testimonials
"Mailshell's technology provides a great balance of low memory usage, high throughput and consistent accuracy." Vincent Steckler, CEO, AVAST Software