MemberSuite has built-in email functionality as part of its baseline product. This can be used to send a mailing to a single contact or a list. These mailings can either be marketing oriented or transactional (e.g. an acknowledgement of a purchase or an event registration). This functionality remains enabled in MemberSuite.
When using the Informz for MemberSuite integration, you'll create, test, and send mailings in Informz. By using Informz directly, you'll also have access to robust reports on subscribers and mailings.