How we measure email

Meisa is an email platform that software products use for onboarding sequences, product notifications, newsletters, win-back campaigns and sign-in emails. Meisa Research uses the send and event logs of those products: when an email was sent, whether it was delivered, bounced or drew a complaint, and each open and click with its time and user agent.

The current window is 3 March to 14 October 2026. Of 83,039 attempted sends, 71,602 were delivered with open tracking switched on, to more than 12,000 recipients, producing 59,149 open events. Emails sent with tracking off, bounced emails and internal test sends are left out.

Email type comes from how the email was sent: an onboarding sequence, a broadcast, a win-back or recovery campaign, a behavioral trigger, a sign-in or verification email, or a direct product notification through the API. Onboarding stages are ordered per recipient by send time.

Mailbox provider comes only from the domain of the recipient address, grouped into Gmail, Outlook.com and Hotmail, Yahoo and AOL, iCloud, and everything else. No other domain is ever reported.

Hours since signup is the gap between the time a contact signed up and the time an email was sent to them, used in the onboarding timing study. Unsubscribes are counted against the last email the contact received in the seven days before.

We publish aggregates only. A figure appears only when its group has at least 300 delivered emails. Each study is a selected sample: its methodology says how many emails we selected and the selection criteria. No recipient addresses, sender names or product names appear in any study.

Every study states its base, and we refresh the figures every quarter as more data comes in.