Bulk email verifier for cleaning a list before you send
Upload a CSV of addresses and Resolvary tells you which ones their mail servers confirm. Bad addresses get flagged before they bounce and hurt your sender reputation. It costs 0.4¢ per check, with no subscription.
How list cleaning works
- Upload your list. Drop in a CSV in the dashboard, or send addresses through the REST API.
- Let it run. Lists run in the background, so you can keep working.
- Export the results. Download CSV or JSON with a result for every address.
What to do with each result
| Result | What it means | What to do |
|---|---|---|
| Verified | The mail server confirmed the mailbox | Send |
| Couldn't verify | No clear answer, often a catch-all domain | Hold back, or send a small separate batch and watch bounces |
| Not found | The mailbox doesn't exist, can't receive mail or is a throwaway inbox | Remove |
Role addresses such as info@ and accept-all domains are flagged as well, so you can decide whether they belong in the campaign. Our guide to catch-all emails covers what to do with those.
Price compared with other list cleaners
The table shows what a check costs at the entry tiers each vendor publishes. Higher volumes bring most of these down.
| Tool | Plan | Cost per check | Unclear results |
|---|---|---|---|
| Resolvary | Per check, no subscription | 0.4¢ (2¢ for a mailbox confirmed on an accept-all domain) | Refunded |
| NeverBounce | $8 for 1,000 credits1 | 0.8¢ | Not stated on its pricing page |
| NeverBounce | Growth, $49 a month up to 10,0001 | 0.49¢ at the full 10,000 | Not stated on its pricing page |
| ZeroBounce | $39 for 2,000 credits2 | 1.95¢ | Free2 |
| ZeroBounce | ONE, $99 a month for 10,0002 | 0.99¢ | Free2 |
| Hunter | Starter, $408 a year for 24,000 credits3 | 0.85¢ at half a credit per check | No credit counted3 |
| Anymail Finder | $49 a month for 1,000 credits4 | 0.98¢ at 0.2 credits per check | Charged for every check4 |
These vendors also sell things Resolvary doesn't. ZeroBounce's subscription bundles inbox placement tests and blacklist monitors, and NeverBounce's Growth plan syncs with your CRM. If you want those, compare the plans on features.
Why clean a list at all
People change jobs and work mailboxes close, so a list gets worse even if nobody touches it. Sending to addresses that no longer exist raises your bounce rate, which can hurt your sender reputation with mailbox providers.
Questions
How often should I clean my email list?
Before any campaign to addresses you haven't mailed for a few months, and whenever you import a list from somewhere else.
Will checking my list send anything to the people on it?
No. Resolvary never sends a message to the addresses it checks.
Does verification guarantee no bounces?
No, and no tool can guarantee that. A Verified result means the mail server confirmed the mailbox when we checked. A mailbox can close afterwards, and some servers accept a message and bounce it later.
Can I check addresses as people sign up?
Yes. Use the REST API to check one address at a time on your signup form. See the email verifier for what each check covers.
Sources
Prices and policies come from each vendor's own pages, read on November 5, 2026. Vendors change these often, so check the page before you buy.