Moving to a new mailer
Switching providers does not lose a single email. The old mailer keeps sending until the new one passes its first test, and the delivery log shows both side by side.
Before you start
Collect the new provider’s host, port and API key. Keys are shown once, so store yours in a secrets manager, not in wp-config.php.
Check your DNS
Add the provider’s SPF and DKIM records. Receiving servers check them on every message.
v=spf1 include:_spf.example.com ~allHow long it takes
DNS changes usually reach every server within an hour, and always within two days.
Questions? The support team answers within one working day.