Unfortunately mailgo is not actively maintained anymore. I'm sorry for this but I personally don't have time to maintain it... I hope someone will take over the project.
a new concept of mailto and tel links https://mailgo.dev
Transform all your mailto and tel link in a beautiful modal with more possibilities!
Open directly Gmail, Outlook and Yahoo for emails; Telegram, WhatsApp or Skype for phone numbers.
https://www.gatsbyjs.com/plugins/gatsby-plugin-mailgo/
https://wordpress.org/plugins/mailgo/