If you are a git user, you can install the theme and keep up to date by cloning the repo:
git clone https://github.com/dracula/mailspring.git
Download using the GitHub .zip download option and unzip them.
Easily install from dracula/homebrew-install:
brew tap dracula/install brew install --cask dracula-mailspring
Get updates about this theme and more. 5,986 people enjoy it.
This theme wouldn't exist without these people. Wanna help too? Check the repository on GitHub.