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Verify email lists instantly — reduce bounces, clean data, and protect your sender reputation.
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What is a dirty email list costing you?
Invalid addresses don't just bounce. You pay your email platform to store them, you burn send volume on them, and the bounces they cause push your good mail into spam. Put in your numbers and see the yearly total.
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Public benchmarks — sources listed
1M+ addresses verified monthly
Estimated annual cost of a dirty list
Revenue at risk
—
Wasted ESP spend
—
Paying your platform to store contacts that can’t receive.
Wasted sends / year
—
Emails that bounce or hit dead inboxes — and drag your sender reputation.
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Three costs, only one of which shows up on an invoice
Most teams notice the platform bill. The other two are larger and quieter.
Visible
Platform spend
Email platforms price by contact count, not by contacts that work. Every dead address sits in your tier and rounds your bill upward every month.
Hidden
Wasted send volume
Sending to an address that no longer exists consumes the same quota as a real one, and returns nothing — no open, no click, no reply.
Compounding
Deliverability damage
This is the expensive one. Bounces tell mailbox providers you don't know your audience, so the mail that would have converted starts landing in spam.
The threshold that changed everything
Above 2% bounces, Gmail stops asking politely
Bounce rate used to be a soft metric. It isn't any more. Gmail permanently rejects senders that cross a 2% hard-bounce rate, and Microsoft enforces the same limit. That turns list hygiene from a nice-to-have into a condition for reaching the inbox at all.
2%
Hard-bounce ceiling enforced by Gmail and Microsoft
0.1%
Spam complaint rate expected of all senders
20–30%
Annual decay of an untouched B2B list
How to bring the
number down
Cleaning is one step. Keeping it clean is what stops the cost from returning next quarter.
01
Clean what you already have
Upload the list and get a status per address — valid, invalid, catch-all or unknown. Remove the invalid ones before the next campaign, not after it bounces.
02
Stop bad addresses at the source
Validate at the point of entry with the API, so a typo in a signup form never becomes a record in your CRM. This is what keeps the list from decaying back.
03
Prepare the inbox before the important send
A clean list still needs a sender with history. The Warm-up Tool ramps your volume gradually so a new domain or inbox isn't judged on a sudden spike.
Methodology
MethodologyWasted platform spend multiplies your invalid contacts by a blended per-contact price drawn from published list tiers, over twelve months. Wasted sends multiplies monthly volume by the invalid rate. Revenue at risk combines bounced sends with a deliverability penalty applied once the bounce rate passes 2%, priced at your revenue-per-delivered-email figure.
FAQs
Questions about List Cost
How accurate is an email list cost estimate?
Why can't I just remove bounces after the campaign?
What counts as a “dirty” email list?
What is an acceptable email bounce rate?
How often should I verify my email list?