Move the email path
with evidence at every step.

Inventory before changing DNS

List senders, domains, templates, event sources, webhook consumers, retry keys and delivery observations. Keep your existing provider active while the new domain and template checks are staged.

Map the behavioral differences

Emailer API uses approved fixed templates, one recipient per event authorization and event-backed safeguards. Broadcasts, arbitrary body overrides, attachments and unrestricted recipient lists are outside the current product contract.

Cut over one event at a time

1. Verify the sending domain and signing records.
2. Install the matching approved template.
3. Connect a real application event and test the callback signature.
4. Validate a representative request without sending.
5. Send a reviewed test and inspect the later delivery outcome.

Use the provider comparison, DNS checklist and current limits to plan the cutover.