Email List Cleaner

About this Email list cleaner

This free online Email list cleaner removes invalid and risky email addresses from your CSV. Upload a file, run the checks, and download a cleaned CSV with only valid addresses. Need to keep every row and just add statuses? Use Email List Validation.

How to use

• Upload a CSV with an email column.
• Optionally enable Deep check (SMTP) for a server handshake.
• Start list cleaning and wait for the validation to finish.
• Download a cleaned CSV containing only valid email addresses.

What we check

• Syntax - Proper email format (name@domain).
• Domain and DNS - Domain exists and resolves.
• MX records - Domain publishes mail exchange records.
• SMTP handshake - Optional recipient check without sending an email.
• Disposable domains - Excludes temporary inbox providers.
• Common typos - Catches mistakes such as gmial.com instead of gmail.com.

What the results mean

• Valid - Overall status for this address.
• No Typo - No common domain or format mistake detected.
• Not Disposable - Not from a temporary email provider.
• Has MX - Domain can receive email.
• SMTP Passed - Server accepted the address during the optional handshake.
• Fail Reason - Why the address was removed from the cleaned export.

Why clean your email list?

Old lists collect typos, closed accounts, temporary inboxes, and addresses that will bounce. Cleaning the list before a campaign helps protect sender reputation and gives you cleaner data to work with.

• Lower bounce rate
• Better inbox placement
• Cleaner audience data
• Protected domain and IP reputation

Why use Sidemail for list cleaning?

• Free CSV-based email list cleaning
• Optional SMTP check for higher confidence
• Simple upload and cleaned CSV export
• Clear failure reasons for every removed address

Validation vs. cleaning: what is the difference?

Validation: runs the checks and downloads your original CSV with a new status column.

Cleaning: uses the same checks, but downloads a filtered CSV with invalid email addresses removed.

FAQ

• What is an email list cleaner?
  It scans a CSV list, checks each email address, and exports a cleaned file with invalid or risky addresses removed.
• Does this tool send test emails?
  No. Even with the optional SMTP check enabled, Sidemail validates the address without sending any email.
• Will it remove disposable or temporary inboxes?
  Yes. Known disposable email domains are treated as risky and excluded from the cleaned export.
• Can it catch typos in email domains?
  Yes. The validation checks for common domain mistakes such as gmial.com instead of gmail.com.
• What if I want to keep every row and just mark invalid emails?
  Use Email List Validation instead. It keeps the original CSV and adds validation statuses.