Twilio SendGrid, Mailgun (now owned by Sinch), and Amazon SES are three of the most widely used transactional email delivery services, each with different pricing models, deliverability tooling, and feature sets that make them suitable for different use cases and scales. SendGrid is the most feature-rich with a marketing email layer; Mailgun offers developer-friendly features including email parsing and validation; Amazon SES is the cheapest at scale with minimal pre-built tooling. Choosing correctly matters because email deliverability depends on infrastructure, and switching providers mid-flight requires IP warming and domain re-authentication.
Pricing Comparison
Amazon SES charges $0.10 per 1,000 emails sent, making it the cheapest option by a significant margin: 100,000 emails cost $10 on SES compared to $89.95 per month for SendGrid Pro (50,000 emails) and approximately $80 per month for Mailgun's Growth plan (50,000 emails). SES is free for emails sent from EC2 instances (up to 62,000 per month), making it effectively free for AWS-hosted applications at moderate sending volumes. SendGrid's free tier allows 100 emails per day and Mailgun allows 5,000 emails per month on its trial. The pricing gap is dramatic at scale: 1 million emails per month costs approximately $100 on SES, $249 on SendGrid Pro, and $300 on Mailgun Scale, with the gap widening further at higher volumes.
Deliverability Tooling and Features
SendGrid provides the most comprehensive deliverability tooling: dedicated IP addresses on Pro and above, IP warming guidance, an email activity log with per-message delivery tracking, bounce and spam report management, an email design editor, a marketing campaign tool, link tracking, and an email validation API. Mailgun offers email parsing (converting inbound emails to webhook events), email validation, inbound routing, a log with 30 days of event history, and a testing inbox for validating email rendering. Amazon SES provides basic delivery metrics through CloudWatch, SNS notifications for bounces and complaints, and a virtual deliverability manager (add-on service) for reputation guidance, but requires AWS infrastructure knowledge to configure monitoring.
Developer Experience
Mailgun has historically been the developer favorite for its clean API, excellent documentation, and email parsing feature that makes it easy to build email-in workflows where inbound emails trigger application actions. SendGrid's API is also well-designed and has a large ecosystem of integration guides and third-party library support. Amazon SES requires AWS account setup, IAM permission configuration, and familiarity with AWS services for monitoring and alerting, which adds meaningful setup friction for teams outside the AWS ecosystem. All three platforms support SMTP as well as HTTP API, enabling integration with any email library in any language.
Which Should You Choose
Choose Amazon SES if you are already an AWS customer, want the lowest possible per-email cost, and are comfortable configuring monitoring and bounce handling through AWS services without a pre-built dashboard. Choose Mailgun if you want a developer-friendly API with email parsing capability for inbound email workflows, a cleaner setup process than SES, and competitive pricing that is lower than SendGrid. Choose SendGrid if you need both transactional email and marketing email campaigns from a single platform, want the most comprehensive deliverability tooling including dedicated IPs and email design tools, or are already using Twilio for SMS and want to consolidate billing. Many production applications use SES for transactional email at scale to minimize cost while using SendGrid or Mailgun as a fallback for deliverability monitoring. Our team can help you configure the right email infrastructure for your sending volume and deliverability requirements.
Conclusion
Amazon SES wins on price, Mailgun wins on developer experience, and SendGrid wins on marketing and deliverability features. The right choice depends on your volume, AWS proximity, and need for pre-built campaign tools. Contact our team to design an email infrastructure that matches your sending requirements and budget.
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