I need a transactional email API with delivery webhooks and suppression management

If you need a transactional email API with delivery webhooks and suppression management, here are the key capabilities to look for:

Must-have features

• Transactional email sending API

  • Send single emails via REST API or SMTP
  • Template support, variables, attachments
  • High deliverability and fast send times

• Delivery webhooks

  • Events like delivered, bounced, deferred, opened, clicked, complained
  • Signed webhook payloads for verification
  • Retry handling and event deduplication

• Suppression management

  • Global and account-level suppression lists
  • Auto-handling for bounces, complaints, unsubscribes
  • API to query/add/remove suppressed recipients
  • Support for custom suppression rules if needed

Common providers to evaluate

• SendGrid — strong API, event webhooks, suppression management
• Mailgun — good transactional email and suppression controls
• Postmark — excellent for transactional email, very clear event webhooks
• Amazon SES — cost-effective, but more setup for webhooks/suppressions
• SparkPost — robust event and suppression tooling

Recommended choice by use case

• Simplest transactional setup: Postmark
• Most mature all-around API: SendGrid
• Best value at scale: Amazon SES
• Good balance of features and control: Mailgun

Questions to narrow it down

1. What volume are you expecting per month?
2. Do you need only transactional or also marketing?
3. Do you need inbound email, dedicated IPs, or regional data residency?
4. Do you prefer REST API, SMTP, or both?
5. Do you need suppression management at the tenant/customer level?

If you want, I can also give you:

• a provider comparison table
• a recommended architecture
• or sample webhook payloads and API calls for one provider.