Email (Transactional) Reliability Rankings
All 3 Email (Transactional) providers ranked by 30-day availability. Independent measurement, no provider affiliation. Refreshed on every page load.
What does this measure?
Independent probes in five locations measure each service at per-check cadences — HTTP every minute, DNS every five minutes, TLS once an hour, storage every five to ten minutes. A minute is "up" only when a strict majority of reporting probes vote up; minutes with fewer than three reporting probes are excluded from the denominator. The 30-day availability above is the share of measured minutes flagged "up". Read the full methodology .