What is Valid Email Checker?

Valid Email Checker is a tool you run before you send. You feed it a single email or a full list, and we tell you which addresses are real, which will bounce, and which ones look risky in ways that are not obvious from the outside.

The short version of why this matters: every bounced email chips away at your sender reputation. Once Gmail or Outlook decides you are sending to too many dead addresses, your future emails (even the ones to real people) start landing in spam. Verifying first prevents the problem instead of recovering from it.

What runs under the hood

Every verification goes through a 9-step process:

1. Syntax validation — is the address formatted correctly?
2. Domain verification — does the domain exist and is it active?
3. MX record check — is the domain configured to accept mail?
4. SMTP verification — does the specific mailbox exist? We connect to the recipient mail server and ask without ever sending an actual email.
5. Catch-all detection — does the server accept every address on the domain regardless of whether the mailbox is real?
6. Disposable email detection — is this a throwaway address from Mailinator, 10MinuteMail, Guerrilla Mail, or similar?
7. Role account detection — is this an info@, support@, sales@, admin@ type address?
8. Spam trap detection — is this a known honeypot used to catch senders with poor list hygiene?
9. Additional checks — free-email-provider, inbox-full, disabled-account, and a confidence score from 0 to 100.

Where it fits in your workflow

Two common patterns. The first is bulk cleanup: you upload a CSV or TXT with your subscribers, we run them through the verification engine, you get back a clean list with each address tagged as Safe, Invalid, Disposable, Catch-All, Role Account, Spam Trap, Disabled, Inbox Full, or Unknown.

The second is real-time verification through our API or through one of the 17 native integrations (Mailchimp, HubSpot, Klaviyo, ActiveCampaign, Brevo, ConvertKit, Mailgun, MailerLite, GetResponse, Constant Contact, SendGrid, Drip, AWeber, Campaign Monitor, Elastic Email, Mailjet, Moosend). A new contact lands in your CRM, we verify it in the background, bad addresses get tagged or unsubscribed automatically.