Category Definitions

below is a comprehensive list of the categories mailfloss uses to classify email addresses during verification invalid email addresses that fail syntax checks and are deemed invalid spam email addresses flagged as potential spam accounts role addresses associated with roles (e g , "administrator") while these emails may be valid, they often underperform and can negatively impact deliverability rates banned email addresses containing banned keywords or domains, such as offensive language or patterns associated with fake or poor quality addresses disposable temporary email addresses provided by disposable email services these are unreliable and negatively affect deliverability illegitimate addresses associated with domains lacking valid mx records, making them incapable of receiving emails these are marked as "illegit" in reports available email addresses linked to inactive domains or domains listed as parked or for sale such addresses are typically invalid unverified addresses that appear valid but cannot be fully verified due to non responsive domains blacklisted email addresses flagged for containing user defined blacklisted keywords bounced addresses that have previously resulted in email bounces, making them risky to use complained addresses that have reported emails as spam in the past, indicating a higher likelihood of future complaints nonexistent addresses determined to be non existent through testing deactivated addresses that have been deactivated and can no longer receive incoming emails inbox full addresses unable to receive emails because the recipient's inbox is over quota failed exchange addresses that fail microsoft exchange testing and pose a high risk of hard bounces sending emails in bulk to these addresses is not advised accept all domains configured to accept all emails appear valid but cannot be fully verified for example, a domain like mailfloss com might validate both martin\@mailfloss com and fakeaddress\@mailfloss com since such domains do not confirm individual addresses, these are flagged as "accept all" in reports skipped verification was skipped for this address, often because the user's plan limits have been reached note we’re constantly improving our verification processes and algorithms if you believe an email has been miscategorized, please reach out to us for manual verifications, you can report errors by clicking the “report as incorrect” button