Migrating from Postmark to MailSend
This guide outlines how to migrate your contacts, templates, domains, credentials, and webhooks from Postmark to MailSend smoothly.
Quick Answer
Migrating from Postmark to MailSend involves exporting list databases and suppressions, updating DNS verification keys (SPF, DKIM, DMARC), and replacing API endpoints or REST API credentials. Most teams complete cutovers in under 2 hours.
1. What to Export
Request a full CSV backup of your suppression list history. Export active HTML templates from the server manager console.
2. API & API Credentials
Replace Postmark's API settings in your application configuration with MailSend API parameters. For API integrations, update parameters to match MailSend's JSON payload properties.
3. Verification & Testing
Configure webhook integrations to receive events for deliveries and bounces, verifying that server endpoints process incoming payloads.
Cutover Checklist
- 1Verify custom domain settings in MailSend settings
- 2Configure SPF, DKIM, and DMARC DNS settings
- 3Export subscriber records and suppression logs from legacy provider
- 4Import contacts CSV database using visual mapper
- 5Replace legacy API keys and API host settings in application server configs
- 6Verify webhook event routes are active and tested
- 7Monitor live delivery metrics in analytics panels