SendGrid vs Mailgun
Two veterans of the transactional email space, both now part of larger telco-style parents.
What matters for SaaS product teams
A SaaS product sends on behalf of its customers, so the deciding factors are tenant isolation, whether suppressions can be scoped rather than global, and whether support can answer why one specific account did not receive one specific email. Lifecycle automation and transactional sending usually need to coexist.
| Priority | SendGrid | Mailgun |
|---|---|---|
| Multi-tenant | Yes | Yes |
| Event stream | Yes | Yes |
| Suppressions API | Yes | Yes |
| Operating since | 2009 | 2010 |
| Scheduling | Yes | Yes |
| Best published rate per 1,000 | $0.40 | $0.70 |
| 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. |
| Webhooks | Yes | Yes |
| Starts at | $19.95/mo for 50,000 emails | $15/mo for 10,000 emails (Basic) |
For a multi-tenant SaaS product running trial expiry notices, dunning, onboarding sequences, and per-tenant transactional mail, SendGrid takes every priority that separates them here (operating track record and best published rate per 1,000), while Mailgun matches it on the rest. On entry price, SendGrid offers $19.95/mo for 50,000 emails against $15/mo for 10,000 emails (Basic) from Mailgun. That ordering reflects this audience. Weigh the same table differently and the answer changes.
Side by side
| Feature | SendGrid | Mailgun |
|---|---|---|
| Multi-tenant | 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. |
| Webhooks | Yes | Yes |
| Starts at | $19.95/mo for 50,000 emails | $15/mo for 10,000 emails (Basic) |
| 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 |
| Pricing model | tiered | tiered |
| API | Yes | Yes |
| SMTP | Yes | Yes |
| SDKs | node, python, go, ruby, php, java, dotnet | node, python, go, ruby, php, java |
| Templates | rich | rich |
| React Email | No | No |
| Inbound | 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
- ›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