1. I will explain the features available in mail3

• Subscription : This subscription feature works for those of you who want to receive updates from a project / community. If you are interested in receiving the latest updates from them, you just go to the subscription tab, select it and click its bell button

- Signature & Text :
This feature works for text and card signatures If you want to manage it you can go to your profile - settings - on - add text what you want

This is an example of a signature