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Zeta GlobalHow email verification works and what each result means
An email verifier tells you whether an address is safe to send to before you hit send. Every bounce is a signal to Gmail, Outlook and Yahoo that you mail people you don't know, and a list full of dead addresses can drag your sender reputation down within a few campaigns.
What this email checker tests
The free check runs four layers. It starts with syntax: the address must follow the format mail systems accept, with no stray spaces, double dots or missing domain. It then looks up the domain in DNS and confirms it has MX records, the servers that receive its mail. A domain without them can't accept email, so the address is invalid no matter how it looks. Next it compares the domain with known disposable inbox services, the throwaway addresses people use to grab a download and disappear. Finally it flags role accounts such as info@, sales@ or support@, which often go to a shared inbox or a ticket system, and common typos like gmial.com or hotmial.com.
Valid, invalid, risky and disposable results
Valid means the syntax is correct and the domain accepts mail. Invalid means the address can't receive email: bad syntax, a domain that doesn't exist, or no mail servers. Risky covers addresses that may work but carry a cost, such as role accounts and likely typos. Disposable means the domain belongs to a temporary inbox service. Remove invalid and disposable addresses, fix obvious typos, and send to risky ones only if you know the contact.
Catch-all domains and checking if an email exists
Some company domains are set to catch-all: the server accepts mail for any address, real or not, and sorts it out later. For these domains no outside check can confirm that one specific mailbox exists, because the server says yes to everything. A free single-address check reads DNS only, so it reports the domain as valid and flags the catch-all risk. Confirming individual mailboxes on a whole list takes a server-level check, and Warmy runs it on full lists as part of every plan.
Why verify emails before sending
Keep your bounce rate under 2%. Above that, mailbox providers start to treat you as a careless sender, and old lists are also where spam traps hide: abandoned addresses that providers turn into traps for senders who never clean their data. If bounces have already started, our guide to fixing bounced emails in Gmail, Outlook and Yahoo shows how to read the codes. Our guide to validating your email database covers how often to clean a list and what to remove.
Next step after you verify an address
A clean list is half of inbox placement. The other half is your domain: check its health with the Domain Reputation Checker, then keep it warm. Warmy verifies lists before you send, warms up your mailboxes with real engagement and shows where your campaigns land in Gmail, Outlook and Yahoo.
Protect your sender reputation before the next campaign. Try Warmy free for 7 days or book a demo with a deliverability expert.
