If your list lives in Mailchimp, the cleanup workflow is simple: export, review, clean, and re-import the version you actually want to send.
Step 1: Export the audience you plan to use
Start from the real Mailchimp segment or audience view you care about, not a random old export.
Step 2: Upload the CSV to Verify List
MailCull works well as the review layer between export and re-import:
- upload the CSV
- let MailCull process the addresses it extracts
- review the status buckets
Step 3: Remove the rows you do not want
Undeliverable rows should usually come out immediately. Risky rows deserve a closer look before you decide whether they belong in the next campaign.
Step 4: Export the cleaned version
Use that export as the file you import back into the next step of the workflow.
Why this matters
If you pay based on contacts or sends, bad rows cost more than deliverability. They can also cost money.
Cleaning before the next campaign helps reduce that waste.