Campaign operations
What Is a Global Email Suppression List?
Learn how a workspace-wide suppression list prevents outreach to unsubscribed, bounced or blocked contacts.
Unlimited · runs in your browser
CSV Email Cleaner
Trim, lowercase, dedupe and syntax-check emails in a CSV, locally.
CSV files stay in your browser and are not uploaded.
Syntax validation only. This does not verify mailbox existence.
What the cleaner does
- Detects the email column from the header, or from the values if the header is unclear.
- Trims whitespace and lowercases every email address.
- Removes rows with a blank email and duplicates of an earlier row.
- Moves syntactically invalid emails into a separate file you can review.
- Keeps every other column exactly as it was.
Resources
Related guides
Quick reads to help you plan audiences, sending volume, sequences and measurement before launch.
Campaign operations
How to Avoid Emailing the Same Prospect Twice
Prevent duplicate outreach across imports, lists, campaigns and multiple sending mailboxes.
Campaign operations
How to Organize Cold Email Leads With Lists and Tags
Use lists for campaign-ready audiences and tags for reusable attributes without losing suppression or history.
From checks to campaigns