head to head
Amazon SES vs Mailgun
Raw infrastructure versus a developer-leaning managed sender.
What matters for teams building autonomous agents
An agent stack treats email as a two-way primitive. Inbound has to arrive as structured JSON a tool call can consume, sends have to be safe to retry when a model loop repeats itself, and every action needs an audit trail. A provider without inbound parsing only solves half the problem.
| Priority | Amazon SES | Mailgun |
|---|---|---|
| Inbound parsing | Yes | Yes |
| Idempotency keys | No | No |
| Webhooks | No | Yes |
| Operating since | 2011 | 2010 |
| Event stream | Yes | Yes |
| Best published rate per 1,000 | $0.10 | $0.70 |
| Batch sending | Yes | Yes |
| SDKs | node, python, go, ruby, php, java, rust, dotnet | node, python, go, ruby, php, java |
| Multi-tenant | No | Yes |
For an agent that reads and writes email running inbound parsing into tool calls and model-generated sends that must not duplicate, Mailgun takes webhook coverage, operating track record, and multi-tenant support, while Amazon SES takes best published rate per 1,000 and SDK breadth. That ordering reflects this audience. Weigh the same table differently and the answer changes.
Side by side
| Feature | Amazon SES | Mailgun |
|---|---|---|
| Webhooks | No | Yes |
| SDKs | node, python, go, ruby, php, java, rust, dotnet | node, python, go, ruby, php, java |
| Multi-tenant | No | Yes |
| Tagline | Cheapest at scale, most setup work. | Developer-leaning email infra, owned by Sinch. |
| Free tier | Up to $200 in AWS Free Tier credits for new accounts | 100/day permanent free plan |
| Starts at | $0.10 per 1,000 emails | $15/mo for 10,000 emails (Basic) |
| Pricing model | pay-as-you-go | tiered |
| API | Yes | Yes |
| SMTP | Yes | Yes |
| Templates | basic | rich |
| React Email | No | No |
| Inbound | Yes | Yes |
| Idempotency | No | No |
| Dedicated IP | Yes | Yes |
| Deliverability | Inherits AWS IP reputation. Generally good once warmed and configured, but the sender does the warming and complaint handling. | Generally good, with deliverability monitoring tools available on higher tiers. Inbound routes and suppressions are battle-tested. |
| DX score | 4/10 | 7/10 |
| Best for | High-volume senders with AWS infrastructure, cost-optimized workloads, and teams comfortable wiring SNS/Lambda/EventBridge for events. | Technical teams that want SMTP relay plus advanced routing. |
Amazon SES
pros
- ›Cheapest cost per email, by a large margin at scale
- ›Built for billions: handles the largest sender workloads in the world
- ›Multi-region (us-east-1, us-west-2, eu-west-1, ap-south-1, and more) with regional reputation pools
- ›Native integration with Lambda, SNS, SQS, EventBridge, and CloudWatch
- ›Dedicated IPs and managed dedicated IP pools
- ›VPC endpoints for sending from private networks
- ›Inbound receiving with S3 and Lambda for fully serverless email pipelines
- ›SDKs in every language AWS supports, from Rust to .NET
- ›IAM-based authentication; no separate API keys to manage
cons
- ›Sandbox mode requires manual approval before sending to non-verified recipients
- ›No native webhooks; events route through SNS and you write your own glue
- ›No dashboard for message-level debugging
- ›Bounce and complaint handling is the sender's responsibility
- ›Templates are minimal
- ›Operational overhead is real if you are not already on AWS
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