Greetings,
Is there a way to automatically send email notifications to client at any task saving? You know, to keep them updated with the progress.
Using the self hosted version v3.9.2, which is great by the way! 
Best regards,
Alex.
It isn’t currently supported.
In our next version clients will be able to see tasks in the client portal.
https://trello.com/c/tyNl2yRi/200-optionally-show-tasks-in-client-portal