We are switching to a new email provider for the cart recovery service: SparkPost. All functionality will stay the same, with the exception of the temporary removal of the following graphs in the cart recovery dashboard: Emails Sent and Email Open/Click Rate.
The reason for this is that SparkPost has not yet launched Subaccounts, which is a required feature for our app to provide these metrics. According to Sparkpost, subaccounts will be rolled out in April 2016.