SendGrid to Loops: Review Each Template Variable

Keep the approved email design in Migma while your team maps each SendGrid template field to its Loops destination. Treat the migration as a review of meaning, defaults, and recipient actions, rather than a quick change of API calls.

A template can look familiar after migration while using the wrong account name or an empty reset link. This Migma-published guide gives product and lifecycle teams an original variable-review worksheet. Official sources were checked on October 15, 2026. It covers creative acceptance; the application owner still owns the sending migration and rollout.

Start with the message the customer needs

Choose one message type, such as an account invitation, and write its purpose in plain language. The reader needs to know what they are being invited to, who the invitation is for, and how to complete it. Use that purpose to decide which content and fields need to survive the move.

Review the current email in Migma with the brand context and approved copy. Keep an archived reference of the old message so the team can distinguish an intentional improvement from a migration defect.

Avoid redesigning every email during the same cutover. If a layout needs a real improvement, record it separately and have an owner approve the change. A stable reference makes it easier to investigate a broken field without debating a new visual direction at the same time.

Map the meaning before the field name

For each variable, record the source, a realistic value, and what the reader should see when it is absent. A field called “name” might mean the account, the purchaser, or the person receiving the message. Matching its spelling across two systems does not establish that the meaning matches.

Use a small review sheet like this original example:

Do not send the designer live credentials or reusable access tokens. Use synthetic examples for layout review, and let the application owner test real authorization behavior with controlled accounts.

Know where Loops expects the content

The official SendGrid-to-Loops migration guide distinguishes HTML sent in code from SendGrid Dynamic Templates. It describes moving content into a published Loops transactional template and passing dynamic values through data variables.

That distinction matters to the review. If the old app constructed a subject or sender at runtime, the implementer must decide how that behavior maps to the destination template. The designer should ask where the reviewed subject, sender, and body now live and how the application selects them.

Keep the approved field names in the published template and sending code synchronized. If a name changes, update the worksheet and repeat the relevant test. Do not silently make a required action optional merely to get a request accepted.

Review defaults as actual copy

A fallback is part of the customer message. “Hello there” can be an acceptable optional-name fallback; an empty button destination cannot. Mark each field as required, optional with reviewed copy, or supplied by the destination.

Prepare examples for a complete profile, a missing optional name, and a very long workspace or product title. Also include a value with punctuation, because realistic names and titles are rarely the shortest possible placeholder.

Ask Migma to keep the approved content intact while you inspect these examples. If a sample produces an awkward sentence, revise the fallback and rerun the review. Do not solve the problem by adding a claim that the underlying data does not support.

Compare the destination message with the reference

Use Migma's HTML download when it fits the handoff. The implementer must adapt the file to the supported destination format and variables. This workflow does not claim a native Migma-to-Loops connector or a one-click conversion of provider-specific template logic.

Run Email Preflight on the creative, then test the destination version. Check the subject and preview text as well as the body. Click the important action in a received test message rather than relying only on the design preview.

Record both the Migma design version and the Loops template selected by the app. A screenshot of a correct draft cannot establish that the production caller uses that template. Keep the test result attached to the exact mapping under review.

Keep contact permissions outside the creative rewrite

The Loops migration guide also calls for preserving unsubscribe, suppression, and list-permission state. Those records belong to the audience and migration owners. Copying a template does not transfer those decisions automatically.

Have the responsible team verify negative states as well as subscribed examples. Do not use a transactional migration as a reason to start sending marketing messages to people who opted out. The purpose of this checklist is to preserve the intended message, not change who may receive it.

Sign off one message type at a time

Ask the designer to accept readable content and the application owner to accept runtime values, routing, failure handling, and the sending owner. Keep a rollback reference for each message type so a problem can be isolated without switching every email again.

Do not delete the old template merely because the new one looks correct in a preview. Follow the migration owner's rollout and rollback plan. After the controlled tests pass, bring only the reviewed findings back into the next creative brief.

Use Migma to prepare the reference and make every field's meaning visible. A successful handoff preserves what the customer needs to understand and do, even when the provider behind the message changes.

Frequently Asked Questions