Moving email platforms is also a decision about what each message is for. A password reset, a product digest, and a feature announcement may share a logo and layout, but they do not share the same sending purpose or audience rules.
Use Migma to prepare a reviewed creative reference for each message, then preserve the purpose and sending ownership while your team plans a Postmark-to-Loops migration. Treat visual consistency as one part of the move. It cannot replace the configuration that determines who receives what.
This guide is published by Migma and focuses on creative and message-purpose review. It is not an independent recommendation to migrate, a legal classification guide, or a claim that one provider delivers better. Official pages were checked on October 16, 2026.
Decide whether the move solves a real problem
Begin with the requirement that prompted the migration. Do you need a different lifecycle workflow, a shared marketing audience, or a clearer operating process? Write that down before changing templates.
Loops' Postmark migration guide acknowledges that a transactional-focused provider can remain a reasonable choice when that is the job you need. It describes Loops as combining transactional templates with marketing campaigns, contacts, and Workflows. Those are different operating choices, not evidence that every team should consolidate.
Migma can help improve and review the creative in either plan. If the existing sender meets your requirements, a design improvement does not by itself justify changing delivery infrastructure.
Identify the purpose before copying the HTML
Postmark's Message Streams page describes separate transactional and broadcast streams. Its examples include user-triggered account messages and messages sent to many readers. Preserve the actual routing intent when planning the destination.
Ask the current sending owner to explain each message using three questions: What causes it? Who should receive it? What should the reader do? Then ask where the rule is implemented today.
For a hypothetical collaboration app, a teammate invitation and a monthly feature digest might look similar. The invitation helps one person accept an invitation that exists. The digest announces changes to an eligible marketing audience. Reusing a visual shell should not merge those purposes.
If a message's classification is unclear, have the responsible policy and platform owners resolve it. Do not let an AI decide from a headline alone, and do not label promotional content transactional just to simplify the move.
Review Migma creative against the destination job
Bring the approved text, images, variables, and destination into Migma. Keep the reader action obvious. For the invitation example, the email should identify the relevant organization, explain the action, and preserve the approved invitation link field. It should not quietly acquire an unrelated promotional section during redesign.
Use a separate brief for the feature digest. Review its audience assumptions, current feature descriptions, and product destinations. A consistent brand can have different content priorities across message types.
Before implementation, record the separation:
| Review item | Invitation example | Feature digest example |
|---|---|---|
| Message job | Accept an existing invitation | Read the current product news |
| Event or audience | Verified invitation state | Approved marketing audience |
| Critical content | Organization, inviter, action link | Accurate feature claims and destinations |
| Sending owner | Application message owner | Campaign owner |
| Final evidence | Controlled invitation test | Final-platform campaign test |
This is an original planning example, not a provider configuration recipe. Replace each entry with your own verified rules and owners.
Map implementation without assuming equivalence
The Loops migration guide distinguishes published transactional templates from campaigns for broadcast traffic. It also explains that Postmark template model fields map to case-sensitive Loops data variables. Have the implementation owner verify the exact template and field contract in the destination.
Migma's export options include reviewed HTML download. They do not establish a native Postmark-to-Loops migration or transfer a sending stream. A preview file is also not the same as an implemented destination template.
Keep sender settings, audience preferences, delivery suppressions, and event handling in the migration plan. The Loops guide explicitly calls for preserving subscription and suppression state and testing each send path before cutover. A contact import should not be treated as new marketing permission.
Avoid reproducing credentials or real private action links in the creative review packet. Use safe representative data supplied by the implementation owner. Keep the final secure values in the appropriate sending system.
Prove one message path before moving another
Run Migma Email Preflight on the approved creative and resolve relevant findings. Then test the implemented message in the destination with the right product state. Confirm the rendered wording, variable values, links, sender identity, and intended recipient behavior.
Assign one active sending owner per message type during the transition. Provider-specific retry controls do not automatically prevent the old and new systems from both sending. Ask the implementation owner to demonstrate the cutover and rollback plan, including queued work.
Save evidence for each migrated path rather than marking the whole program complete after one successful preview. If the invitation works but the digest's audience state is unreconciled, record those as different statuses.
Use the final comparison to improve your next Migma brief: which wording survived implementation, which fields needed clearer definitions, and which sender-side wrapper changed the layout. Preserve those findings without treating a successful migration test as a guarantee of future delivery or inbox placement.
Frequently Asked Questions
Does a Migma HTML export move Postmark Message Streams?
No. It provides reviewed creative. The implementation owner still needs to map message purpose, templates, variables, sender configuration, audience state, and sending ownership in the destination.
Should every Postmark user move to Loops?
No. Start with a documented requirement. A transactional-focused provider can remain suitable when it already meets the job. Improving email creative does not itself justify moving the sending infrastructure.
Can one migration test prove all message types work?
No. An invitation, reset, and newsletter can use different templates, data, audience rules, and send paths. Record separate final-platform evidence for each path before marking it migrated.
What prevents both providers sending during cutover?
Your implementation needs one active owner for each message type, plus a tested transition and rollback plan for queued work. Provider-specific retry controls do not deduplicate messages across different providers.