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What do the mailbox providers say about engagement?
We read the sender pages of Google, Yahoo and Microsoft on 3 November 2026. Google says it does not track open rates, that a low open rate is not necessarily an accurate sign of deliverability, and that user spam reports lower reputation. It also suggests unsubscribing recipients who do not open or read your messages. [1] Yahoo mentions an active and engaged audience and says mail sent to people who are not reading it harms delivery, but names no metric. [2] Microsoft's page sets authentication rules and no engagement threshold. [3]
| Provider | What the page says | Reply rate or reading time named? |
|---|---|---|
| Does not track open rates; user spam reports lower reputation; consider unsubscribing recipients who do not open or read | No | |
| Yahoo | Mentions an active and engaged audience; mail to people who are not reading it harms delivery | No |
| Microsoft | Authentication rules for senders of more than 5,000 emails a day; no engagement threshold | No |
An earlier version of this post said filters now score reply depth and reading time after Gmail's October 2026 rollout. We could not support that from any provider page, and Gmail's AI Inbox is a view for to-dos and summaries and does not filter spam, so we removed it.
Why relevance may still matter
People mark mail they did not want as spam, and the spam rate is limited: Google asks for under 0.10% and never 0.30%, Yahoo for under 0.3%. [1][2] A message that gives its reader a specific reason to read should be reported less often. That is our reasoning from the documented rule, not a measured result, and we have no reply or spam-report data of our own yet to publish.
If you are diagnosing a deliverability problem, check the technical floor first: authentication on a delivered message, one-click unsubscribe, the spam rate in the provider's own tools and your daily volume against a warm-up schedule. The list is in the deliverability preflight.
Common questions
Do replies improve email deliverability?
No provider page we read says so. Google says it does not track open rates and that user spam reports are what lower reputation. [1]
Does Gmail's AI Inbox change where cold email lands?
Gmail's AI Inbox adds a view of to-dos and topic summaries. It does not block cold email. See Gmail's AI now sorts your buyer's inbox.
What should I check first if my cold email is not landing?
The technical floor is SPF and DKIM passing on a delivered message, DMARC for bulk sending, one-click unsubscribe, the spam rate in the provider's own tools, and daily volume against a warm-up schedule.
