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How Do Unengaged Recipients Hurt Delivery?

Author:
Laura
Source:

In the comments Ulrik asks: “How can unengaged recipients hurt delivery if they aren’t complaining? What feedback mechanism is there to hurt the the delivery rate besides that?”
 
There are a number of things that ISPs are monitoring besides complaint rates, although they are being cautious about revealing what and how they are measuring things. I expect that ISPs are measuring things like:

  • How many users read a particular mail?
  • How many users click through on a particular mail?
  • How many users have the senders from: address in their address book?
  • How many users receiving the mail have abandoned their accounts or not logged in for months?
  • How many users never open a particular mail?

 
Some of these values senders can measure as well...

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