Word to the Wise: ESPs, Non-portable Reputation and Vendor Lock-in
“Portable reputation is reputation that is tied to you, and mostly independent of your ESP. You can build up a history of sending email that people want to receive through one ESP, then you can move to a different ESP and take all that good history with you, keeping all the delivery advantages. (Or use multiple ESPs for different campaigns and send some mail from in-house and pool your good reputation across all those sources of mail.)”


