Google has released an updated Gmail API that functionally replaces the Email Settings API. The Gmail API includes a number of new endpoints that enable features previously unavailable through any Google API. Developers have access to filters, auto-replies, send-as aliases, and more.
Despite attempts to reinvent it, email is still one of the most popular ways to communicate across the internet. Developers have long been able to take advantage of Emails popularity using various libraries that support POP, SMTP and IMAP. This is fine when you have access to a publicly available web server, but for small and hobby developers this can be an unacceptable cost.