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Source:
| Word to the Wise |
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...
