SendGrid – Making Email Delivery Easy
http://sendgrid.com/

SendGrid transparently handles DKIM, SPF, ISP rate limits, content inspection, bounces, and spam reports to help users achieve higher deliverability. SendGrid integrates in minutes by just changing three SMTP settings. We even assign our users their own IP addresses. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog. This has been added to eCommerce Resources Subject Tracer™ Information Blog.