Why Clean a List Before You Import It
Every list collects addresses that stop working: people change jobs, mailboxes get closed, and some addresses were mistyped from the start. Mail to them bounces, and mailbox providers treat a high bounce rate as a sign of a careless or unwanted sender. That can push your other emails toward spam.
Verifying the list first removes those addresses before they cost you anything. Bouncer checks each address and sorts it into deliverable, risky, undeliverable or unknown.
How Sequenzy Helps
You don't have to remember to verify every list. When too many addresses in a list don't exist or look risky, the import wizard asks you to clean the list in Bouncer and upload the cleaned file before anything is imported. Imports through the API, CLI and MCP are stopped the same way and marked Needs cleaning.
After you start sending, Sequenzy keeps the list healthy on its own: permanent bounces are suppressed automatically, and your sender health is tracked for every campaign.
A Simple Routine
| When | What to do |
|---|---|
| Before importing a list | Verify it in Bouncer and import only deliverable addresses |
| Sequenzy asks you to clean a list | Run it through Bouncer, remove the flagged addresses and upload the cleaned file |
| Every few months | Export your contacts, verify them and unsubscribe the addresses Bouncer flags |