There's also Mailgun.net. Infact I co-wrote a mailgun ruby client sometime back ...

		SingAlong on Nov 30, 2012 \| parent \| context \| favorite \| on: Show HN: My side project CreateMyInvoice.com creat... There's also Mailgun.net. Infact I co-wrote a mailgun ruby client sometime back http://github.com/hashnuke/mailgun