Keep transactional email dependable. Add the lifecycle around it.
Map each Postmark stream and application call to an explicit message category, preserve suppression state, and cut over one critical path at a time.
✓One stream first. Verify it, then move the rest.
Inventory before cutover
Inventory
Source material read
Rebuild
Created paused
Verify
Real inbox test
Switch
One trigger first
Destination flow
Paused until validation and explicit cutover
[ 01 / 03 ]What moves
Preserve the contract behind every transactional message.
Inventory servers and streams
Record which application owns each stream, sender, message type, webhook, and environment boundary.
Rebuild templates against real payloads
Carry variables and metadata with the message contract, then compare rendered output before publishing.
Protect critical recipients
Import suppressions first, test real inboxes, and retain a rollback path for receipts, resets, and alerts.
[ 02 / 03 ]Concept map
Translate streams into message purpose and product state.
Keep the transactional boundary clear while linking each message to its contact and originating event.
Delivery
Message streams
Product events and explicit message categories
Templates
Postmark templates
Versioned templates with typed variables
Cutover
Application call sites
One message type moved after inbox validation
Questions people ask us
Give every critical message a tested way across.
Inventory the stream, verify the payload and callback, then move one message type.