I agree. Open rates are a bit wonky. If your list is more or less static in size and domain distribution then looking at open rate deltas can be informative. R

I agree. Open rates are a bit wonky. If your list is more or less static in size and domain distribution then looking at open rate deltas can be informative. Regarding click rate, here's some cool research I got to do recently: http://blog.mailchimp.com/what-good-marketers-can-learn-from-v1agr-spammers/ http://blog.mailchimp.com/what-good-marketers-can-learn-from...