UptimeProject

Email (Transactional) Reliability Rankings

All 3 Email (Transactional) providers ranked by 30-day availability. Independent measurement, no provider affiliation. Refreshed on every page load.

Email (Transactional) services ranked by 30-day availability
Rank Provider Status 30d
#1 Mailgun Operational
100.00%
#2 Postmark Operational
100.00%
#3 SendGrid Operational
100.00%

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 .