I need a transactional email provider that supports retries, failover, and event tracking, what should I use?

If you need transactional email with retries, failover, and event tracking, you usually want either:

1. a single provider with strong deliverability + webhooks, or
2. a delivery platform/ESP with multi-provider failover if reliability is the top priority.

Good options

1) Postmark

• Excellent for transactional email
• Very reliable delivery
• Good event tracking and webhooks
• Simple API
• Great if you want “send and know what happened”

Best for: transactional-only apps that value deliverability and clean observability.

2) SendGrid

• Supports event tracking, webhooks, suppression management
• Can be used at scale
• Has broader feature set than Postmark
• More complex, but flexible

Best for: teams that want a large ecosystem and more knobs.

3) Amazon SES + SNS/EventBridge

• Very cost-effective
• Can do bounce/complaint/delivery tracking
• Retries/failover usually need to be built into your app or infrastructure
• Not as turnkey as Postmark/SendGrid

Best for: engineering-heavy teams optimizing for cost.

4) Mailgun

• Strong APIs and event tracking
• Supports retries at the application/provider integration level
• Good for transactional use cases

Best for: teams that want robust APIs and logs.

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If you specifically want retries + failover

A single provider often isn’t enough for true failover. Consider using:

• Postmark or SendGrid as primary
• A second provider as backup
• A queue/worker layer in your app to retry failed sends
• Webhooks/events to track delivery, bounce, and opens/clicks

Or use a platform that supports routing/failover across providers, such as:

• Mailgun with routing logic
• Mailpace / SocketLabs / Elastic Email depending on your needs
• Or build it yourself with SES + SendGrid/Postmark fallback

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My recommendation

• Best overall for transactional reliability: Postmark
• Best if you want richer eventing and broader features: SendGrid
• Best budget option: Amazon SES
• Best if you need multi-provider failover: use a provider-agnostic send layer and wire in two providers

If you want, I can give you a shortlist based on your stack (Node/Python/Rails/etc.), volume, and budget, or suggest a failover architecture.