> For the complete documentation index, see [llms.txt](https://docs.clearout.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.clearout.io/help-and-support/featured-answered/email-verifier.md). # Email Verifier
What does the Clearout Email Verifier do? Clearout Email Verifier checks whether an email address is valid and capable of receiving emails. It performs 20+ validation checks including format validation, domain checks, MX record verification, SMTP validation, and detection of disposable or role-based addresses to determine the deliverability of each email.
What validation checks does the Email Verifier perform? Clearout performs multiple validation checks, including: * Email format validation * Domain and MX record verification * Catch-all domain detection * Disposable email detection * Role-based email detection * Gibberish email detection * SMTP server validation These checks help determine whether an email address is valid and safe to send to.
What is the accuracy rate of Clearout Email Verification? Clearout Email Verifier provides **up to 99.73% accuracy** by combining machine learning with multiple validation checks and proprietary verification algorithms.
Does Clearout send emails to verify email addresses? No. Clearout does **not send emails** to the recipient inbox.\ Verification is performed by securely connecting to the recipient's **SMTP server** to validate the email address.
Can Clearout detect catch-all (accept-all) domains? Yes. Clearout can identify catch-all domains that accept all incoming emails regardless of whether the mailbox exists.
Can Clearout detect disposable email addresses? Yes. Clearout detects temporary or disposable email domains commonly used for spam, fake signups, or short-term use.
Can I verify email addresses in real-time? Yes. Clearout supports real-time email verification through: * REST API * Form Guard * WordPress plugin This allows you to verify emails at the point of form submission or signup.
Can I verify emails in bulk? Yes. Clearout allows bulk email verification by uploading a file in .csv or .xlsx format or importing lists from supported integrations.
How many free email verifications are available? After creating a Clearout account, you can verify up to 100 email addresses for free.
How much does one email verification cost? Each email verification consumes 1 credit.
Can I integrate the Email Verifier with my software? Yes. Clearout Email Verifier can be integrated into your applications using the [Clearout API](https://docs.clearout.io/developers/api/email-verify), which supports integration with any programming language.
What is AI Verdict in Clearout Email Verification? AI Verdict is the classification result/human-readable result generated using Clearout’s machine-learning system that analyzes email addresses based on multiple parameters such as domain credibility, typos, and patterns to determine whether an email should be accepted, rejected, or reviewed.
Why can a “Guaranteed Deliverable” email still bounce? While Clearout provides up to 99.73% verification accuracy, there are rare situations where a verified email may still bounce due to external mail server behavior. This can happen because of: * **Email status propagation delays**\ Some mail servers take time to update mailbox status. If verification happens during this update window, the result may temporarily appear valid. * **Anti-spam protected mail servers**\ Certain servers hide the true mailbox status behind spam filters. In these cases, the actual status can only be confirmed after sending an email. * **Email forwarding rules**\ If an email address forwards to another mailbox, the verification system may detect the forwarding endpoint rather than the final destination. * **Non-standard or internal mail server configurations**\ Some mail systems (often internal corporate servers) do not follow standard SMTP validation responses, making accurate verification difficult. * **Microsoft Office 365 behavior**\ Some Office 365 servers respond as if a mailbox exists during verification but may still reject emails when delivery is attempted. * **Educational (.edu) domains**\ Many educational institutions configure their mail servers to always return a positive response, even when the mailbox does not exist. The actual status may only be revealed during real email delivery. Because these behaviors depend on the **recipient mail server configuration**, they are outside the control of any email verification service.
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