Transactional email API with validation, deliverability and email testing.
#2 of 5 in Email Deliverability by Overall Score
Mailgun (Sinch) is an email API for sending, receiving and tracking email, with Validate for list verification, Optimize for deliverability and Inspect for pre-send testing (formerly Email on Acid).
Mailgun is organized around programmable email infrastructure instead of a creator-style newsletter workflow. Teams can send through REST APIs or SMTP, validate recipient addresses, and use deliverability tooling around the same sending stack, which makes it a closer fit for applications and engineering-owned messaging than drag-and-drop campaign production.
Calculated from facts we verified on Mailgun's own website, using published thresholds. Nobody can pay to change it. Together with Market Signal it makes the Overall Score of 68 that orders our lists.
Dimensions without verified data count as a neutral 2.5. Facts checked October 6, 2026. How the rating works
Computed from Ahrefs + Semrush data about Mailgun's own website. Not an assessment of the product itself. How this works →
Market Strength
55
Where it stands today
Momentum
47 Declining ↓↓
Where it’s heading
Data Confidence
Medium
How much to trust it
Tick mark = category average.
Compared with 42 tracked Email Marketing tools. Data through September 2026, pulled October 6, 2026.
| Plan | Monthly | Annual (mo) |
|---|---|---|
| Free | Free | Free |
| Basic | $15 | Not listed |
| Foundation | $35 | Not listed |
| Scale | $90 | Not listed |
| Enterprise | Custom | Custom |
Pricing shown reflects list prices as of our last check and may have changed. Confirm current pricing on Mailgun's website before purchasing.
No major integrations documented.
Email, Phone, Live chat, Help center
Why choose it: Small and midsize businesses that want marketing email, transactional messaging and a basic sales CRM from one vendor.
Strengths
Limitations
Why choose it: Developer and product teams sending and testing application email.
Why choose it: Email marketers cleaning lists before sending.
Why choose it: Product-led and lifecycle marketing teams that need event-triggered customer messaging tied closely to product and behavioral data.
Why choose it: Email senders diagnosing why messages land in spam.
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Developer email API with React templates, domain management and event webhooks.
Transactional email service separating message streams for application and broadcast delivery.
Email marketing platform with automation flows, segmentation, landing pages and a marketing CRM.
Email platform combining campaign design, transactional sending and automation.
Yes, Mailgun offers both a free plan and a free trial of its paid tiers.
Mailgun starts at $15/mo (varies by email volume) on its Basic plan. Pricing was last checked September 28, 2026. Always confirm current pricing on the vendor's site before purchasing.
Commonly considered alternatives include Brevo (formerly Sendinblue), Mailtrap, ZeroBounce, Customer.io and GlockApps. The Alternatives section on this page shows what each one is best at and its starting price.
