Mailopinion is a free service which allows you to measure the quality of your emails.
Simple to set up, and easily usable by the user, it will allow you to collect feedbacks on your emails through smileys or thumbs, without the user wasting time.Get started
Advantages of Mailopinion
Built with Firebase, all functionalities are free to use.
It fits perfectly into any email, and requires only one click from users.
The system is very quick to set up and integrate into your emails, regardless of the number of emails.
Create multiples campaigns on the same account.
Users can leave feedback after they have voted.
Easily view the analytics of your campaigns with charts and averages.
Multiples widgets are available, with smileys or thumbs.
Usefull for emails, it's also can be used in static files (eg. PDF).