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Goal Switch safely by overlapping setup, verifying sends, and cutting over gradually. Checklist
  1. DNS & identity
  • Add domain; configure SPF/DKIM/DMARC; verify pass.
  1. Events & tracking
  • Events are managed automatically; after test sends, confirm delivery/open/click in the timeline.
  1. Contacts & preferences
  • Import CSV with emails, names, and consent metadata.
  • Preserve suppressions; do not auto-resubscribe.
  1. API integration
  • Replace send endpoint calls with /api/v1/emails/send.
  • Add Idempotency-Key; handle 429 with backoff.
  1. Parallel test
  • Send a subset via Fluxomail; compare deliverability and engagement.
  1. Cutover
  • Switch traffic gradually; monitor bounce/complaint rates.
  1. Cleanup
  • Decommission old webhooks and rotate keys.
Related
  • Guides: Set up deliverability, Monitoring & Events, Contacts & segmentation