In every one of your MailChimp campaign reports, there’s a section called Email Domain Performance:

It can answer important questions like, “Are any ISPs blocking me?” and “Which ISPs do my subscribers use most?”
It can also answer expensive questions, like, “Should I invest in email certification services like SenderScore (which gives you some benefits with Hotmail, Roadrunner, and Cox), or Goodmail (which gives you some benefits with AOL, Comcast, and Yahoo), or SuretyMail (which works with AOL, Yahoo, Hotmail, Earthlink among others)?
Email certification can get email past spam filters and into inboxes with images on by default, and in some cases, video will work.
But are they too expensive? Why not test? Here’s how:
(more…)