Ready to send? You'll set your from name and address, pick the groups who'll receive it, and either send now or schedule for later. You can also use Xactcast's trigger email feature to have an email send automatically when someone signs up, has a birthday, and more.
Are some recipients in more than one group? Don't worry - Xactcast will make sure that if Bob is in three of the groups you're emailing, he'll only receive one email. Bob would want it that way.