The list you already have
Don’t let last year’s file hit this month’s domain.
A dormant prospect dump looks harmless in a spreadsheet. Mail it cold and you find out which mailboxes died — the expensive way. Clean it first.
What you are risking
- Bounces from addresses that left the company years ago.
- Catch-alls that accept anything — including your sequence.
- A domain reputation you spent months building.
You don’t need a bigger list. You need a list you can actually send.
Upload CSV, TXT, or XLSX. Watch the job. Every row comes back Valid, Invalid, Risky, or Unknown — with a reason, not a mysterious percentage.
Mailbox accepted. Protocol evidence — still not a delivery receipt.
Syntax, disposable, no MX, or a hard reject. Do not send.
Catch-all, role, toxic. Actionable — not fake Valid.
Timeout, greylist, blocked probe. You are not charged.
Then export what you are willing to mail.
Take Valid only, or Valid plus high-confidence catch-alls. Catch-alls stay Risky on the row — we will not inflate the file to look healthier than it is.
Why this classification exists · Pricing · Evidence on Trust