Google has announced its latest API with a haiku of all things:
New admin tool dawns
Settings change like the seasons
For hosted email
That's from Andrew Olsen of the Google Apps team, announcing the Google Email Settings API, which allows IT administrators at organizations that use the Gmail-based Google Apps hosted webmail solution to "programmatically update Gmail settings for their users in bulk by making requests to a GData feed." Previously, settings could only be changed manually, on an account-by-account basis.
Email, which is one of the oldest services available on the internet, is a key mechanism via which you can reach out to your users. Over the last year, the number of services providing this infrastructure as a service has grown to include 6 email sending APIs. The newest, Amazon Simple Email Service, validates the market.
Our API directory now includes 199 email APIs. The newest is the Uptime Robot API. The most popular, in terms of mashups, is the SendGrid API. We list 10 SendGrid mashups. Below you'll find some more stats from the directory, including the entire list of email APIs.