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.

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.