Global email sending volume by consumer email provider
It would be great to have a breakdown of messages sent to specific providers for a project I am working on. It could be a specific email service provider, like Mailchimp, but I have not found any helpful blog entries breaking down their message volume sent to the various consumer mail providers.
Is anyone aware of a helpful chart or statistical study? I'd like to include Yahoo Mail, Gmail, Outlook.com (anything Microsoft, hotmail.com, msn.com, live.com, etc) and AOL.
Thanks!