The best alternatives to Inboxer are Polymail , Google, and Manageyum. If these 3 options don't work for you, we've listed a few more alternatives below.
Polymail is the email platform for teams. By combining email with real time collaboration and integrating it with your team's other tools, Polymail allows everyone to work together seamlessly, move faster, and be more productive.
Search the world's information, including webpages, images, videos and more. Google has many special features to help you find exactly what you're looking for.