How to migrate off of SendGrid

Migrating off SendGrid is mostly about replacing three things:

1. Email delivery (API/SMTP sending)
2. Templates (dynamic templates, transactional content)
3. Tracking/ops (bounces, spam complaints, suppression lists, logs, webhooks)

A good migration plan is:

1) Inventory what you use in SendGrid

Make a checklist of:

• Sending method: API, SMTP, or both
• Use cases: transactional, marketing, password resets, receipts, alerts
• Templates: dynamic templates, substitutions, categories
• Webhooks: delivered, bounced, dropped, spam report, open/click
• Suppression management: unsubscribe lists, bounces, invalid emails
• IP/domain setup: authenticated domains, dedicated IPs, link branding

2) Pick the replacement

Common alternatives:

• Postmark: great for transactional email
• Amazon SES: cheap and flexible, more setup
• Mailgun: API-friendly, similar feature set
• SparkPost: robust deliverability tooling
• Resend: modern developer experience, simpler stack

Choose based on:

• Transactional vs marketing
• Required deliverability
• Region/compliance needs
• Cost and volume
• Template and webhook support

3) Set up sending on the new provider

Before switching traffic:

• Verify domain authentication: SPF, DKIM, DMARC
• Configure custom return-path / bounce domain if supported
• Warm up a dedicated IP if you need one
• Recreate sender identities and aliases
• Test from staging first

4) Migrate templates

If you use SendGrid dynamic templates:

• Export template HTML/content
• Rebuild them in the new provider’s template system, or
• Move template rendering into your app using something like:
  • MJML
  • React Email
  • Handlebars/Liquid/ERB depending on stack

Keep an eye on:

• Template variables
• Conditional logic
• Inline CSS
• Unsubscribe/footer requirements

5) Rebuild event handling

If you rely on SendGrid webhooks:

• Map event types from SendGrid to your new provider’s events
• Update your app to process:
  • delivery
  • bounce
  • complaint
  • deferred
  • unsubscribe
• Preserve suppression logic so you don’t keep emailing invalid recipients

6) Migrate suppression and recipient data

Export/import:

• Unsubscribes
• Bounces
• Spam complaints
• Global suppression list
• Marketing segments or lists if relevant

This is important to protect deliverability and compliance.

7) Send parallel traffic

Do a phased rollout:

• Start with internal/test emails
• Then a small subset of transactional traffic
• Monitor:
  • delivery rate
  • bounce rate
  • latency
  • complaint rate
  • inbox placement if possible

Keep SendGrid live temporarily as a fallback.

8) Cut over sending

Once stable:

• Switch API keys / SMTP credentials in config or secrets manager
• Update DNS records if needed
• Disable SendGrid sending from production
• Monitor closely for at least 1–2 weeks

9) Decommission SendGrid

After confidence is high:

• Remove old credentials
• Delete unused templates and API keys
• Turn off webhooks
• Review billing and account closure requirements

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Practical migration tips

• Abstract your email layer so providers are swappable in the future.
• Use a single internal interface like sendEmail({to, template, data}).
• Store provider message IDs so you can correlate events.
• Keep a rollback path for the first few days.

If you want the fastest path

For most teams:

• Transactional email: Postmark or SES
• Simple modern app/email stack: Resend
• High control / low cost: SES

If you want, I can also give you:

• a step-by-step migration checklist
• a provider comparison
• or a code example for switching from SendGrid to SES/Postmark/Resend in your language/framework.