I need an email API for a marketplace app with multiple brands. Which services support separate domains, suppression lists, and webhooks?

For a marketplace app with multiple brands, you’ll want an email provider that supports:

• separate sending domains per brand
• separate suppression lists or account-level suppression management
• webhooks/event callbacks for delivery, bounce, complaint, opens/clicks, etc.

Here are the main services that fit well:

Strong fits

1) SendGrid

• Separate domains: Yes, supports multiple authenticated sending domains.
• Suppression lists: Yes, supports global and custom suppression management.
• Webhooks: Yes, very solid event webhooks for delivered, bounced, dropped, spam reports, unsubscribes, etc.
• Good if you want broad API features and easy scaling across brands.

2) Mailgun

• Separate domains: Yes, multiple domains per account are standard.
• Suppression lists: Yes, supports suppression lists, bounces, complaints, unsubscribes.
• Webhooks: Yes, strong event/webhook support.
• Good developer experience, especially if you want domain-based isolation.

3) Postmark

• Separate domains: Yes, supports multiple sender signatures/domains, and can segment by server.
• Suppression lists: Yes, but mostly oriented around message streams and server-level suppression handling.
• Webhooks: Yes, reliable webhooks for delivery, bounce, open, click, spam complaints.
• Great for transactional email; less ideal if you need heavy marketing-style workflows.

4) Amazon SES

• Separate domains: Yes, supports multiple verified identities/domains.
• Suppression lists: Yes, account-level suppression list support.
• Webhooks: Not native in the same way as others, but you can wire events through SNS, CloudWatch, or EventBridge.
• Best if you want low cost and are okay with more setup.

5) SparkPost

• Separate domains: Yes.
• Suppression lists: Yes.
• Webhooks: Yes, strong event webhooks.
• Good deliverability tooling, though market presence is smaller than SendGrid/Mailgun.

Also worth considering

6) Brevo (Sendinblue)

• Separate domains: Yes.
• Suppression lists: Yes.
• Webhooks: Yes.
• Useful if you also want marketing automation in the same platform.

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Best choices by use case

• Best overall for multi-brand SaaS/marketplace: SendGrid or Mailgun
• Best for transactional-only reliability: Postmark
• Best budget option: Amazon SES
• Best if you also need marketing automation: Brevo

Important architecture note for marketplaces

If each brand needs clean separation, look for:

• one subaccount or server per brand
• domain-level authentication per brand
• brand-specific suppression handling
• event webhooks that include brand metadata

This avoids one brand’s bounces or complaints affecting another’s reputation.

If you want, I can also give you:

1. a comparison table of these providers, or
2. a recommended architecture for multi-brand email in a marketplace app.