Overview
Mailgun and Amazon SES represent different philosophies in email infrastructure. Mailgun is a managed platform that handles deliverability, analytics, and optimization for you. Amazon SES is raw email infrastructure - incredibly cheap but requiring significant engineering investment to use effectively.
The choice between them often comes down to build vs. buy: do you want to build your email infrastructure on AWS primitives, or pay more for a managed solution? Check our Mailgun comparison for alternatives.
The True Cost Comparison
At face value, Amazon SES costs $10 for 100,000 emails versus Mailgun's $75. But this comparison misses crucial factors:
Analytics: SES provides only CloudWatch metrics. You will need to build dashboards or integrate third-party tools.
Bounce handling: SES uses SNS notifications that you must process and act on. Mailgun handles this automatically.
Webhooks: SES requires Lambda functions to process email events. Mailgun provides native webhook endpoints.
Email validation: Not included with SES - you will need a separate service.
For teams with infrastructure engineers and AWS expertise, SES can deliver real savings at scale. For everyone else, the engineering cost often exceeds Mailgun's premium. Learn more about email infrastructure decisions.
Developer Experience
Mailgun offers a more straightforward developer experience. Sign up, verify your domain, and start sending. Their dashboard provides immediate visibility into deliverability, and webhooks work out of the box.
Amazon SES requires more initial setup: IAM permissions, domain verification through Route 53 or manual DNS, configuring SNS topics for notifications, and setting up CloudWatch alarms. If you are already deep in AWS, this feels natural. If not, expect a learning curve. Check our email API alternatives for simpler options.
Deliverability Management
Mailgun provides automatic suppression list management, bounce processing, and reputation monitoring. Their dashboard shows you exactly what is happening with your email program.
With Amazon SES, you are responsible for maintaining your sender reputation. You must process bounce and complaint notifications, manage your own suppression lists, and monitor deliverability metrics manually. This gives you more control but requires more work.
When Each Tool Shines
Choose Mailgun when: You want email infrastructure that just works. You do not have dedicated email engineers, and you value your team's time over raw sending costs.
Choose Amazon SES when: You are already all-in on AWS, have engineers who can build and maintain email infrastructure, and send enough volume that the cost savings justify the investment.
The Sequenzy Alternative
For SaaS companies, the infrastructure question might be beside the point. Do you really need to manage transactional email infrastructure separately from your marketing email?
Sequenzy unifies both in a single platform with Stripe integration, behavioral automation, and simple per-subscriber pricing. No infrastructure to build, no per-email costs to track, and full visibility into customer communication.
Engineering Time as a Hidden Cost
The $65 monthly price difference between SES ($10) and Mailgun ($75) at 100,000 emails seems significant. But building SES infrastructure - SNS topics for bounce handling, Lambda functions for webhook processing, CloudWatch dashboards for monitoring, and suppression list management - easily consumes 40-80 hours of engineering time. At typical engineering rates, that initial investment dwarfs years of Mailgun's premium.
For teams already running on AWS with dedicated infrastructure engineers, SES amortizes that cost across existing expertise. For teams without AWS depth, Mailgun's managed approach is almost certainly more cost-effective.
Deliverability Management Approaches
Mailgun provides automatic suppression list management, bounce processing, and reputation monitoring through a visual dashboard. You configure it once and the platform handles the ongoing work. This hands-off approach suits most teams well.
With SES, deliverability management is your responsibility. You process bounce notifications, maintain suppression lists, monitor reputation metrics, and handle IP warmup manually. This gives you more control but requires ongoing operational attention. Teams without email infrastructure experience often struggle with SES deliverability management.
Scaling Considerations
SES shines when you reach millions of emails monthly. At 10 million emails, SES costs approximately $1,000 while Mailgun would cost significantly more. The crossover point where SES's savings justify the engineering investment varies by team, but generally starts around 500,000 to 1 million monthly emails.
Below that threshold, Mailgun's managed approach typically delivers better total value. Above it, SES becomes increasingly attractive if you have the engineering capacity to support it.
Delivery Speed and Reliability
Mailgun and Amazon SES both deliver transactional email quickly once configured, but quickly takes different amounts of setup to reach. Mailgun's Scale plan, around $75 a month for 100,000 emails, comes with validation, analytics, and automatic bounce handling already wired in. SES sends at roughly $10 for the same volume, but reaching that same reliability means building your own bounce processing through SNS and your own dashboards through CloudWatch first.
API Design and Developer Experience
Mailgun documents its REST API and SMTP relay comprehensively, with SDKs in eight or more languages and native webhooks that arrive ready to use. Amazon SES gives you AWS SDKs in every language AWS supports, but webhook-style notifications require setting up SNS and Lambda yourself, and the documentation reads like general AWS docs rather than an email-specific guide. Mailgun's onboarding is faster; SES rewards teams already fluent in AWS.
Scaling and Cost at Volume
At 100,000 emails a month, Amazon SES's roughly $10 in sending costs looks like a fraction of Mailgun's $75 Scale plan. But that comparison only covers the email itself. SES's price does not include the analytics dashboards, validation, or bounce handling Mailgun bundles in, so once you add the engineering time to build those yourself, the gap between the two narrows considerably for teams without spare AWS capacity.
Use-case matchups
| Situation | Best first look | Why |
|---|---|---|
| Team wants managed email infrastructure with logs and support | Mailgun | Mailgun is better when you want deliverability tooling, webhooks, validation, and suppression handling ready-made. |
| AWS-native team sending very high volume | Amazon SES | SES is compelling when AWS expertise already exists and raw sending cost matters most. |
| Small team without email infrastructure ownership | Mailgun | Mailgun's premium can be cheaper than building and maintaining SES tooling. |
| Infrastructure team wants maximum control and lowest unit cost | Amazon SES | SES gives primitives, not a full product, which suits teams ready to build around it. |
| SaaS team wants email workflows, not infrastructure projects | Sequenzy | Sequenzy is relevant when the goal is lifecycle, transactional, and campaign email rather than raw infrastructure. |
Best Fit by Managed Email Infrastructure and AWS Cost Control
Best email API for managed logs, validation, and support
Mailgun is the better fit when teams want production sending, webhooks, validation, suppression handling, inbound routing, deliverability tooling, and support without building everything around SES.
Best raw email infrastructure for AWS-native high-volume teams
Amazon SES is the better fit when engineers already own AWS operations and want maximum control, lowest unit cost, bounce processing, monitoring, and infrastructure primitives.
Best email tool for SaaS workflows instead of infrastructure projects
Sequenzy is the better fit when lifecycle campaigns, transactional messages, Stripe events, and newsletters are the goal rather than building and maintaining a raw email stack.
Pricing reality
SES wins on raw per-email cost, but only if you include the engineering and operational cost honestly. Bounce processing, complaint handling, suppression lists, dashboards, alarms, warmup, and deliverability monitoring must be built or integrated.
Mailgun costs more per email because it packages more of that operational layer. Its price is easier to justify when engineering time is scarce or email reliability issues would interrupt product work.
Sequenzy should be compared when the buyer needs marketing and transactional email workflows. It is not a substitute for SES if the requirement is low-level AWS email infrastructure.
Review signals
The Mailgun review snippets in this page point to API power, validation, and developer infrastructure, with pricing and limited free-tier value as cautions.
The Amazon SES snippets point to low cost, AWS integration, and high-scale deliverability, with technical setup as the core caution. That caution is the whole buying decision: SES is cheap only for teams prepared to operate it.
Migration checklist
| Workstream | Moving to Mailgun | Moving to Amazon SES | Moving to Sequenzy |
|---|---|---|---|
| Infrastructure | Configure domains, API keys, webhooks, validation, suppressions, and logs. | Configure IAM, SES identity verification, SNS, Lambda/queues, CloudWatch, suppressions, and alarms. | Configure workspace, sending domains, and product/billing event sources. |
| Bounce handling | Use Mailgun's webhooks and suppression tools. | Build or integrate bounce and complaint processors from SNS notifications. | Preserve suppressions and map delivery events into subscriber reporting. |
| Templates | Rebuild transactional templates and variables. | Rebuild templates or app-rendered email payloads. | Rebuild transactional and campaign templates together. |
| Deliverability | Use Mailgun dashboards, validation, and reputation tools. | Build monitoring for reputation, bounces, complaints, warmup, and sending quotas. | Warm domains and monitor campaign/transactional performance together. |
| Cost controls | Monitor volume, validation, dedicated IPs, and support tiers. | Monitor sending volume, AWS usage, engineering maintenance, and third-party tools. | Monitor included email volume and lifecycle workflow fit. |
Decision checklist
- Do you have AWS/email infrastructure ownership available long term?
- Is the monthly send volume high enough to justify SES buildout?
- What is the cost of 40-80 hours of initial engineering work?
- Do you need managed deliverability tooling, validation, and support?
- Are you solving infrastructure cost or SaaS lifecycle email execution?
