head to head
SendGrid vs Mailgun
Two veterans of the transactional email space, both now part of larger telco-style parents.
What matters for teams choosing a transactional API
Judged purely as an API. What the request contract guarantees on retry, how complete the webhook event coverage is, whether suppressions are readable and writable programmatically, and how much the message log retains when something needs debugging in production.
| Priority | SendGrid | Mailgun |
|---|---|---|
| Idempotency keys | No | No |
| Webhooks | Yes | Yes |
| Event stream | Yes | Yes |
| Operating since | 2009 | 2010 |
| Suppressions API | Yes | Yes |
| Best published rate per 1,000 | $0.40 | $0.70 |
| Batch sending | Yes | Yes |
| SDKs | node, python, go, ruby, php, java, dotnet | node, python, go, ruby, php, java |
| Deliverability | Established delivery infrastructure, but shared-IP reputation can vary and the product is broader than pure transactional delivery. | Generally good, with deliverability monitoring tools available on higher tiers. Inbound routes and suppressions are battle-tested. |
For a transactional workload running high-frequency programmatic sends where a missed delivery is a product failure, SendGrid takes every priority that separates them here (operating track record, best published rate per 1,000, and SDK breadth), while Mailgun matches it on the rest. That ordering reflects this audience. Weigh the same table differently and the answer changes.
Side by side
| Feature | SendGrid | Mailgun |
|---|---|---|
| Webhooks | Yes | Yes |
| SDKs | node, python, go, ruby, php, java, dotnet | node, python, go, ruby, php, java |
| Deliverability | Established delivery infrastructure, but shared-IP reputation can vary and the product is broader than pure transactional delivery. | Generally good, with deliverability monitoring tools available on higher tiers. Inbound routes and suppressions are battle-tested. |
| Tagline | Twilio-owned veteran with broad SDK coverage. | Developer-leaning email infra, owned by Sinch. |
| Free tier | 60-day free trial only (permanent free tier was removed May 2025) | 100/day permanent free plan |
| Starts at | $19.95/mo for 50,000 emails | $15/mo for 10,000 emails (Basic) |
| Pricing model | tiered | tiered |
| API | Yes | Yes |
| SMTP | Yes | Yes |
| Templates | rich | rich |
| React Email | No | No |
| Inbound | Yes | Yes |
| Multi-tenant | Yes | Yes |
| Idempotency | No | No |
| Dedicated IP | Yes | Yes |
| DX score | 6/10 | 7/10 |
| Best for | Enterprises that want a single Twilio-backed vendor for email and SMS. | Technical teams that want SMTP relay plus advanced routing. |
SendGrid
pros
- ›Mature, broad SDK coverage
- ›Twilio backing means long-term operational stability
- ›Marketing platform alongside transactional
- ›Inbound parse webhook is well-documented
cons
- ›Removed the permanent free tier in May 2025
- ›No idempotency keys
- ›No API request logs for debugging
- ›Pricing climbs steeply across plan tiers; many features gated to higher SKUs
- ›Legacy v3 API patterns feel dated next to Resend or MailerSend
Mailgun
pros
- ›Strong SMTP relay support, useful when migrating off self-hosted Postfix
- ›Inbound routes with regex matching
- ›Validation and parsing tools available
- ›Sub-accounts for agency use cases
cons
- ›Overage pricing and plan differences need close review at scale
- ›Documentation is comprehensive but occasionally out of date
- ›No idempotency keys
- ›Sinch ownership has moved focus toward enterprise