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.
Email doesn't need postage, right? Is that old hoax about the postal service charging per message finally coming true? Not really. But PostageApp may be a service worth paying for if you want to send email from your application.
Twitter yesterday announced updates to its developer platform terms that aim to reign in the use of automation by bad actors "to perform coordinated actions across multiple accounts." Twitter's updated policies forbid applications from posting identical content to multiple Twitter accounts.