How to Migrate a Cloud Application That Uses a Third-Party Email Relay

An application may send notifications through a third-party relay that restricts source addresses, domains, or message volume. Moving the application can break outbound mail or change authentication and deliverability.

What to check

Inventory relay credentials, allowed IPs, sender domains, rate limits, bounce handling, and message types. Test password resets, alerts, and transactional messages from the target environment without sending real customer data.

Recommended next step

Coordinate any allowlist and authentication changes with the relay provider, then test representative message flows. Preserve monitoring for rejection and bounce events after cutover.

How Informatix Systems can help

Informatix Systems provides cloud migration and business email integration services. We can review the system, trace dependencies, and help plan a practical fix. Contact us with the platform involved, when the issue began, and non-sensitive error details.