What should I use if I need better deliverability than Mailgun?

If you need better deliverability than Mailgun, the best options usually depend on why Mailgun is underperforming for you. In practice, these are the most common alternatives people move to:

Strong deliverability alternatives

• Postmark — Often considered one of the best for transactional email deliverability.
  • Great for password resets, receipts, notifications
  • Very strong reputation and simple setup
• Amazon SES — Excellent deliverability and very low cost.
  • Best if you’re comfortable with more technical setup
  • Works well at scale
• SparkPost — Historically strong for deliverability and analytics.
  • Good tooling, but reputation varies by use case
• SendGrid — Broadly used, good features, but deliverability can vary depending on plan and configuration
• Brevo (Sendinblue) — Decent for mixed transactional + marketing use, though not always top-tier for pure transactional deliverability
• Resend — Newer, developer-friendly, focused on transactional email; often praised for simplicity and good inboxing, though less battle-tested than Postmark/SES

If your goal is specifically inboxing

For transactional email, I’d usually rank these first:

1. Postmark
2. Amazon SES
3. SparkPost
4. Resend
5. SendGrid

Important note

Deliverability is not only the provider. It also depends on:

• SPF, DKIM, and DMARC being set up correctly
• Sending domain reputation
• List hygiene and bounce handling
• Email content and links
• Whether you send marketing and transactional mail from the same domain/IP

My practical recommendation

• If you want the easiest high-deliverability choice: Postmark
• If you want best value at scale: Amazon SES
• If you want modern dev experience with good deliverability: Resend or Postmark

If you want, I can give you a provider-by-provider comparison based on your use case:

• transactional vs marketing
• low volume vs high volume
• budget constraints
• need for dedicated IPs or shared IPs