ElasticEmail:

Elastic email is an email service for both developers and business manager of a cloud application. Compared to cloud application platforms such as Windows Azure and Amazon EC2, who set limits on emails and doesn’t provide an email delivery service, ElasticEmail provides direct email transfer through simple REST APIs.

Microsoft Exchange Online:

Microsoft Exchange Online is an email, calendar and contacts solution delivered as a cloud service, hosted by Microsoft. It is essentially the same service offered by hosted Exchange providers and it is built on the same technologies as Microsoft Exchange Server. Exchange Online provides end users with a familiar email experience across PCs, the Web and mobile devices, while giving IT administrators or small businesses and professionals web-based tools for managing their online deployment.[32]

Microsoft Exchange is available both as on-premises software and as a hosted service with Exchange Online. Customers can also choose to combine both on-premises and online options in a hybrid deployment.

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