Is MageMail compatible with Magento 2?

Yes, it is. We released a new platform with Magento 2 compatibility in October 2017. This new product includes additional enhancements to the UI and analytics. However, we will be in a transition phase in October and November, at which time we will still run both the old and next generation platform. You can subscribe to the new platform here: https://v2.magemail.co. However, we recommend that you also contact us so that we can ensure a smooth onboarding process and that you have the latest version of the connector.