WiseSenderFind the addresses that will bounce.
Each address is checked against its own mail server, without sending anything. You get a verdict, a score and a reason you can act on.
Free for up to 100 checks a day without an account.
Eight checks on every address.
They run in order and stop early when the answer is already clear, so a dead domain never waits on a mail server.
Format
Catches stray spaces, missing parts and characters no mail system accepts.
Domain and mail servers
Confirms the domain exists and publishes MX records that accept mail.
Mailbox
Asks the receiving server whether this exact inbox exists, then hangs up before any message.
Catch-all
Spots domains that accept every address, where a yes from the server proves nothing.
Throwaway inboxes
Flags temporary inbox providers that people use to grab a signup bonus and vanish.
Shared inboxes
Marks role addresses such as info@, sales@ and support@ that many people read.
Typos
Suggests the intended domain when someone writes gmial.com or yaho.com.
Full inboxes
Reports mailboxes that exist but are over quota and will reject new mail.
A score from 0 to 100
One number to sort and filter by, alongside the category and the reason.
What each result means.
Every address lands in one of these categories. Deliverable and shared inbox are safe to send; the rest need a decision.
The mailbox exists and accepts mail. Score 90 to 95.
A role address on a working mailbox. Safe to send, lower reply rates.
The domain accepts any address, so the inbox can't be confirmed. Send carefully.
Quick mode only: the domain is fine, but the inbox itself was not asked.
The server would not answer clearly. Power-mode unknowns are refunded.
The mailbox exists but is over quota. Try again later.
A temporary inbox provider. Usually not a real customer.
Bad format, dead domain, no mail server or no such mailbox. Remove it.
Bulk lists without the spreadsheet surgery.
Drop in a CSV or TXT export. We pull out the email column, remove duplicates, and charge only for unique addresses.
- Up to 20,000 addresses per upload, processed in the background
- Watch progress live, leave and come back later
- Filter by category and download CSV or Excel
- Start a campaign straight from a verified list
Two speeds.
- Power modeThe full check including the mailbox. Takes a few seconds per address and is the right choice for lists you are about to email.
- Quick modeFormat, domain, mail server, throwaway and typo checks in under a second. Made for signup forms where a person is waiting.
Clean your list before the next send.
100 free checks when you sign up and 20 more every day.