SendGrid vs Mailgun
Two veterans of the transactional email space, both now part of larger telco-style parents.
What matters for developers picking email infrastructure
The question here is which one a backend engineer would rather operate. That means SDK depth in the language already in use, whether a retry can safely be replayed, how much the event log tells you when a customer says the email never arrived, and whether the pricing curve stays sane as volume grows.
| Priority | SendGrid | Mailgun |
|---|---|---|
| DX score | 6/10 | 7/10 |
| SDKs | node, python, go, ruby, php, java, dotnet | node, python, go, ruby, php, java |
| Idempotency keys | No | No |
| Operating since | 2009 | 2010 |
| Event stream | Yes | Yes |
| Best published rate per 1,000 | $0.40 | $0.70 |
| Webhooks | Yes | Yes |
| 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. |
| Free tier | 60-day free trial only (permanent free tier was removed May 2025) | 100/day permanent free plan |
For a developer-owned stack running password resets, receipts, and magic links shipped from application code, SendGrid takes SDK breadth, operating track record, and best published rate per 1,000, while Mailgun takes developer experience. On free tier, SendGrid offers 60-day free trial only (permanent free tier was removed May 2025) against 100/day permanent free plan from Mailgun. That ordering reflects this audience. Weigh the same table differently and the answer changes.
Side by side
| Feature | SendGrid | Mailgun |
|---|---|---|
| DX score | 6/10 | 7/10 |
| SDKs | node, python, go, ruby, php, java, dotnet | node, python, go, ruby, php, java |
| Webhooks | Yes | Yes |
| 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. |
| Free tier | 60-day free trial only (permanent free tier was removed May 2025) | 100/day permanent free plan |
| Tagline | Twilio-owned veteran with broad SDK coverage. | Developer-leaning email infra, owned by Sinch. |
| 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 |
| Best for | Enterprises that want a single Twilio-backed vendor for email and SMS. | Technical teams that want SMTP relay plus advanced routing. |
SendGrid
- ›Mature, broad SDK coverage
- ›Twilio backing means long-term operational stability
- ›Marketing platform alongside transactional
- ›Inbound parse webhook is well-documented
- ›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
- ›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
- ›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