ⓘ PieSync has been acquired by Hubspot. They have announced their end of service by August 2021. Please keep it in mind if you intend to use this integration with Missive.
With the PieSync integration, you will be able to automatically sync your contacts between Missive and Flexmail in both directions.
Getting started is easy, just follow this link and follow the steps. With this link, you will get a $50 coupon!
Watch this video to learn more about PieSync and how it can help you sync your contacts between Missive with Flexmail.