Over 2 months I monitored block-list data for the shared IP pools that Marketing Automation vendors offer their customers (Act-On,Campaign Monitor,Eloqua,Hubspot,MailChimp,Marketo,Pardot). Now that I have the data, I'm analyzing it and writing an article. I'll be sharing figures for average MTBF, MTTR and the 2 main approaches vendors use to manage their IP pool. If you can think of other insights that people would be interested in, or are interested in doing an initial reading, then do reply!