Duplicate automation emails often appear when a new journey starts while customers are still waiting inside the old one. Stopping new entries does not necessarily stop queued messages. During a Shopify marketing migration, decide explicitly what happens to people already in progress, choose a clear cutover point, and watch the first real customer paths after the switch.
Identify active and waiting customers
Inventory the journeys being replaced and understand how each current system handles paused, stopped, or queued actions. Record the customers or cohorts that may still receive a message after the change, using appropriate access controls for any exported data.
Define the replacement behavior in Sendvio. Decide whether existing participants should finish the old sequence or move to the new one. Do not assume an imported customer should automatically enter every welcome or purchase journey again.
Choose a policy for people already waiting
There are two common planning choices: let existing participants finish the old journey while only new qualifying events enter the replacement, or move a defined group through a carefully controlled transition. The appropriate choice depends on what the systems can represent and what data is available. Do not assume an arbitrary waiting state can be imported directly.
For checkout recovery, a customer might have received the first reminder and be waiting for the second. Starting the new journey from its first step could repeat the introduction or send an outdated offer. Record the intended next action for that customer rather than treating every existing record as a fresh entrant.
Confirm what each control does in the actual setup. Preventing new entries may leave queued messages active; pausing may preserve waits; stopping may have different consequences. Verify the behaviour with the responsible team and document it before using the control in a live handoff.
Choose a clear transition point
Set a cutover time and assign one owner to coordinate activation. Confirm the old entry conditions and pending sends, then enable the intended new workflow only when overlap is understood. Keep the plan specific enough that another team member could execute it.
Preserve unsubscribe and invalid statuses throughout the handoff. A migration should not reset the customer's communication choices. Also check whether a campaign scheduled near the transition could add another message to the same audience.
Write a cutover timeline with one coordinator
Before the agreed time, finish data and content checks, identify waiting groups, and confirm the old workflow's planned state. At cutover, one owner coordinates the relevant changes and records what was activated or held. Afterward, inspect new events and waiting participants separately.
Include events close to the boundary. A subscriber created just before the change and another created just after it should each have one intended welcome path. A purchase during a recovery delay should still stop the relevant sales reminders. Use controlled cases first and keep real-customer data handled appropriately.
Watch the first real paths
Use controlled scenarios for a new subscriber, a recent purchaser, and someone waiting in a recovery delay. Verify that each receives the expected number of messages and that purchase or opt-out conditions still stop later steps.
After the handoff, review the first cohort for duplicate or missing communication before expanding other journeys. Save the transition notes with the automation records. A clean cutover is less about choosing a quiet hour and more about understanding which customer belongs to which sequence at that hour.
Reconcile expected and observed sends for the first cohort. Look for both duplication and omission: avoiding two welcome emails by accidentally sending none is not a complete success. Check message identifiers, timestamps, and the applicable journey where available, rather than relying only on a total daily send count.
Keep the transition record until the relevant old waits and exceptions are resolved. If a rollback is needed, use that record to decide who still requires a message and who already received it. A clean cutover preserves customer state across the boundary. The quiet hour you choose helps coordination, but it cannot replace knowing which person belongs to which path and what should happen next.