An interesting announcement from Amazon which offers a free cloudy email service (my bold).
Amazon Simple Email Service (Amazon SES) (beta)
Amazon Simple Email Service (Amazon SES) is a highly scalable and cost-effective bulk and transactional email-sending service for businesses and developers. Amazon SES eliminates the complexity and expense of building an in-house email solution or licensing, installing, and operating a third-party email service. The service integrates with other AWS services, making it easy to send emails from applications being hosted on services such as Amazon EC2. With Amazon SES there is no long-term commitment, minimum spend or negotiation required – businesses can utilize a free usage tier and after that enjoy low fees for the number of emails sent plus data transfer fees.
I have not used this service yet so I cannot comment on how it compares to alternatives such as Postmark or Sendgrid which offer value added services such as templates and reporting. If you have, or have used Postmark or Sendgrid please add a comment to this post.