Does Todoist integrate with eM Client? If yes, how? Thank you!
Unfortunately not, but we may consider it in the future and you're welcome to vote for this request in our Votebox: https://todoist.com/Vote/show/7331/
For now, as a workaround, instead of linking emails as tasks, you could use the "Email tasks to this project" option (right-click on any project to access it) which doesn't require any plugins and will allow you to forward mails to your projects and convert them to tasks.