Overview
Courier and Amazon SES are at different layers of the messaging stack. SES is ultra-cheap email delivery. Courier is notification orchestration that can route through SES. They're often used together rather than as alternatives. For our take on each, see our Courier comparison and Amazon SES comparison.
The Complementary Pattern
Many teams use Courier with SES as the email provider. Courier handles routing logic - which channel, which provider, what fallbacks. SES handles the actual email delivery at $0.10/1,000 emails. This combination gives you multi-channel routing with the cheapest email delivery.
When SES Alone Suffices
If email is your only channel and cost is the priority, SES directly at $5/month for 50k emails beats any other option. Adding Courier on top only makes sense if you need multi-channel routing.
Pricing reality
At the cited 50k-email tier, Amazon SES is listed at $5/month and Courier is listed as $0-$99+/month plus provider costs. SES is the raw cost winner for email-only delivery. Courier adds value only when routing, preferences, templates, fallbacks, or multi-channel orchestration are worth paying for on top of provider fees.
Sequenzy is listed at $49/month for SaaS teams that want transactional and marketing email without owning AWS email infrastructure or notification routing logic.
Review signals
The Courier reviews cited here praise using Courier with SES for routing plus cheap delivery, and for unifying SES, FCM, and Twilio behind one API. The SES reviews praise extremely low cost and reliability after setup, while warning that sandbox exit, DNS, IAM, and bounce handling require real engineering time.
That makes this less of an either/or decision and more of an architecture choice: direct SES for cheapest email, Courier plus SES for orchestration, or a unified email product when engineering time is the limiting cost.
Use-case matchups
| Use case | Better fit | Why |
|---|---|---|
| Cheapest direct email delivery | Amazon SES | SES is the better choice when the goal is raw email delivery at the lowest possible cost. |
| Multi-channel notification orchestration | Courier | Courier is stronger when email, push, SMS, in-app, and fallbacks need one routing layer. |
| AWS-native engineering team | Amazon SES | SES fits teams comfortable with IAM, DNS, sandbox exit, bounce handling, and AWS operations. |
| Provider abstraction over SES and others | Courier | Courier adds routing and preference logic on top of SES, Twilio, FCM, and other providers. |
| Email-only product notifications | Amazon SES | Direct SES is simpler and cheaper if there is no channel routing problem. |
| SaaS marketing plus transactional email | Sequenzy | Sequenzy is better when the team needs email campaigns, transactional messages, and Stripe automation without managing AWS email infrastructure. |
The Sequenzy Alternative
For SaaS founders who want simplicity over AWS complexity, Sequenzy combines transactional email and marketing campaigns with Stripe integration at $49/month - no AWS knowledge required.
The Complementary Architecture
The most common pattern is using Courier with SES as the email delivery provider. Courier handles the routing logic - deciding which channel to use, managing fallback sequences, and respecting user preferences. SES handles the actual email delivery at the lowest cost in the industry. This layered architecture gives you intelligence on top of cheap infrastructure.
The alternative is using SES directly, which saves Courier's fees but means building routing logic yourself. For teams with only email needs and no multi-channel requirements, direct SES integration is simpler and cheaper. The routing layer only adds value when you have multiple channels or multiple providers to manage.
Setup Complexity Compared
SES requires AWS-specific knowledge - exiting sandbox mode, configuring IAM roles, setting up DNS records (SPF, DKIM, DMARC), handling bounces and complaints, and managing sender reputation. For experienced AWS teams, this takes hours. For teams new to AWS, it can take days.
Courier's setup involves configuring the routing logic and connecting providers. While the visual designer simplifies notification routing, you still need to set up each underlying provider separately. This means setting up SES for email, FCM for push, and Twilio for SMS individually, then connecting them through Courier's routing layer.
When to Just Use Sequenzy
If your SaaS company primarily needs email - transactional messages like password resets plus marketing campaigns like onboarding sequences - the Courier-plus-SES combination adds unnecessary complexity. You are maintaining two services (Courier + SES), configuring AWS infrastructure, and still lacking marketing campaign features.
Sequenzy provides transactional and marketing email in one platform with no infrastructure to manage. The $49/month all-inclusive pricing is more than SES's raw delivery cost but dramatically less than the engineering time required to set up, monitor, and maintain SES. For most SaaS teams, engineering time is the most expensive resource.
Delivery Speed and Reliability
For transactional email, delivery speed is non-negotiable. Receipts, password resets, and verification codes need to arrive in seconds. Both Courier and Amazon SES prioritize fast delivery, but their approaches differ in infrastructure and routing.
Transactional email reliability involves more than just speed. It requires consistent inbox placement, proper authentication, and monitoring. Compare how each platform handles DKIM, SPF, and DMARC setup, and which provides better tools for ongoing email deliverability monitoring.
API Design and Developer Experience
Courier and Amazon SES both target developers, but with different philosophies. The quality of API documentation, SDK support, and error handling directly impacts how quickly your team can integrate and how much ongoing maintenance is needed.
Developer experience goes beyond the API itself. Consider webhook support for tracking delivery events, sandbox environments for testing, and how each platform handles rate limiting and error recovery. These details matter when your application depends on email delivery.
Scaling and Cost at Volume
Email costs become significant at scale. What starts as a few hundred emails per day can grow to millions. Understanding how Courier and Amazon SES price at different volume tiers helps you plan for growth without budget surprises.
Beyond per-email pricing, consider dedicated IP costs, email validation charges, and support tier pricing. Some platforms offer volume discounts that significantly change the economics at higher sending volumes. For SaaS companies needing both transactional and marketing email, explore Sequenzy's unified approach.
Best Fit by Notification Architecture
Best notification router for multi-channel fallback logic
Courier is the better fit when the team needs one abstraction over email, SMS, push, in-app, and Slack notifications. Its value is routing, preferences, fallbacks, and provider abstraction, not cheaper email delivery by itself.
Best raw email infrastructure for AWS teams
Amazon SES is the better fit when email is the only channel and engineering wants the lowest direct sending cost. It suits teams that can own IAM, sandbox exit, domain authentication, SNS bounce handling, complaint processing, monitoring, and reputation operations.
Best SaaS email platform for lifecycle campaigns and transactionals
Sequenzy fits SaaS teams that primarily need email, not multi-channel orchestration. It is the better fit when password resets, receipts, onboarding campaigns, newsletters, and Stripe-triggered lifecycle messages should live together without maintaining Courier plus SES.
Migration checklist
- Decide whether SES will be used directly or as one provider behind Courier; the architecture changes code ownership and operations.
- Export templates, verified domains, senders, IAM policies, provider configs, routing rules, preferences, suppressions, bounce logs, and delivery reports.
- If moving to SES directly, build or replace routing logic, preference management, template rendering, bounce handling, complaint handling, and monitoring.
- If moving to Courier, map each notification type to a channel, provider, fallback rule, preference category, and payload contract.
- Configure SPF, DKIM, DMARC, SES sandbox exit, IAM permissions, event destinations, webhooks, and alarms before production traffic.
- Rebuild critical transactional templates first: verification, password reset, invite, receipt, billing, system alert, and digest emails.
- Test deliverability, bounce handling, complaint handling, and fallback routing with a small production cohort before moving all traffic.
- Preserve historical cost and delivery reports so the team can compare raw SES savings against Courier's orchestration value.
Decision checklist
| Question | Choose Courier when... | Choose Amazon SES when... |
|---|---|---|
| What problem are you solving? | Routing, preferences, fallbacks, and multiple notification channels. | Cheapest possible direct email delivery. |
| What should engineering own? | One notification API and provider abstraction are worth the extra layer. | The team can own AWS setup, monitoring, bounces, complaints, and templates. |
| What cost matters most? | Developer speed and unified notification logic matter more than raw email price. | Raw per-email cost is the primary constraint. |
| What should you verify first? | Provider costs, routing rules, preference model, templates, and channel coverage. | Sandbox exit, IAM, DNS authentication, event destinations, deliverability, and support. |
