I'm working on a little open source project about mailto links. It's called mailgo (https://mailgo.js.org). Instead of the classic behaviour of the mailto links, the idea is to show a modal with more possibilities for the user, for example to copy immediately the email address. It' WIP but on the website you can see a working demo.
What do you think about? Suggestions?
If you like it, star the repo on GitHub https://github.com/manzinello/mailgo, thank you!