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.
Mandrill, a Mailchimp add-on, announced an outage early this week. The company reported that users could send emails, but could not receive emails. Additionally, users experienced errors when using webhooks and scheduled mailings. On February 5th, the company reported that it had resolved the issue.