Media & Publishing / Newsletter
Email Deliverability / Inbox Placement Rate ~ (aliases: delivery rate, IPR inbox placement rate, sender reputation, deliverability)
Whether the newsletter actually reached subscribers' inboxes, which is not the same as whether the mail server accepted it.
The fork, why two teams get different numbers
"Delivered" and "in the inbox" are different events, and conflating them is the core fork.
In the Metric Library
- The full fork, both definitions worked all the way through
- The trap that makes the number lie, on a real export
- Every formula variant, spelled out
- The reconciliation anchor, what to tie it to and when to refuse
Reference: M3AAWG sender best-practices and deliverability guidance (reference); email-deliverability measurement convention (no single standards body)