Time to Inbox
Time to Inbox (TTI) is our live measure of email delivery speed: how long an email takes to reach the inbox, counted from the moment your send request reaches our servers all the way until the message lands. We send real test messages to Gmail, Yahoo and Outlook every 15 minutes and record how long each one takes. This is live data, measured the same way every time.
How providers compare
Typical time to inbox per hour, all providers on one scale. Hover any point to read every provider at that moment.
Time to inbox by provider
Each provider on its own scale. The solid line is the typical time; the shaded band drops to the fastest delivery in each hour. Hover any point for the exact numbers.
Gmail
Outlook
iCloud
Yahoo
TTI is measured from the moment a send request reaches our servers to the moment the message appears in the destination inbox, read from the timestamps the message itself carries. Only successful inbox deliveries count toward these numbers.
Why email delivery speed matters
For password resets, login codes and order confirmations, email delivery speed is part of the experience. A message that lands in a couple of seconds feels instant. One that takes minutes leaves people waiting, retrying, or assuming it never arrived.
We keep these times low by running our own outbound infrastructure across an anycast network, routing each message through the nearest data center and the cleanest IP for the destination. The numbers above are the result, published live rather than promised in a pitch.
For the full story, here is why we measure Time to Inbox, and how.