---
title: "Email (Transactional) Uptime & Reliability"
description: "30-day and 90-day uptime rankings for the largest Email (Transactional) providers. Independent measurement, no provider affiliation."
url: https://uptimeproject.org/category/email/
built: 2026-11-06T12:58:15.145Z
---

# 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 | 7d | 30d availability | 30d downtime | 90d |
| --- | --- | --- | --- | --- | --- | --- |
| Tied for 1 | [Mailgun](https://uptimeproject.org/service/mailgun/) | Operational | 100.00% | 100.00% | 0 min | 100.00% |
| Tied for 1 | [SendGrid](https://uptimeproject.org/service/sendgrid/) | Operational | 100.00% | 100.00% | 0 min | 100.00% |
| #3 | [Postmark](https://uptimeproject.org/service/postmark/) | Operational | 100.00% | 99.99% | 1 min+1 min degraded | 99.99% |

## 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](https://uptimeproject.org/methodology/) .