BillionVerify Help center
Straight answers about verification results, billing, and how BillionVerify works.
Common questions about BillionVerify
Learn what each result means, when credits are charged, and what to expect from mailbox verification.
13 answers
What do the verification statuses mean? (valid, invalid, catch-all, unknown, disposable, role)
Understand valid, invalid, catch-all, unknown, disposable, and role results, including which outcomes use credits.
Provider limitationsWhy are iCloud (icloud.com / me.com / mac.com) addresses not marked "valid"?
Learn why iCloud, me.com, mac.com, and Hide My Email addresses return unknown instead of valid.
Provider limitationsWhy are Outlook / Hotmail / Live addresses not marked "valid"?
Learn why personal Microsoft addresses return unknown and how Microsoft 365 business domains differ.
Verification resultsWhat does an "unknown" result mean, and what should I do with it?
Unknown means the receiving mail system did not provide a reliable answer; it does not mean the address is bad.
Verification resultsWhy is an address marked catch-all instead of valid?
Catch-all means the domain accepts every recipient without confirming whether the specific mailbox exists.
Verification resultsWhy was an address I believe is active marked "invalid"?
Invalid is based on a concrete rejection from the receiving server, not a guess about the mailbox.
Verification resultsWhat does the "score" in the result mean?
The 0.0–1.0 score reflects deliverability confidence and should always be read together with the status.
Verification resultsWhy did my result change when I re-verified the same address?
Cached results and temporary mail-server conditions can explain why a later verification returns a different status.
Billing and creditsWhich results consume credits?
See which verification outcomes cost one credit and which results are always returned free of charge.
Billing and creditsDo you charge for disposable / temporary email addresses?
Disposable-domain detection is free unless you explicitly request and complete a full live SMTP verification.
Billing and creditsAm I charged again if I verify the same address twice?
Repeat checks for the same account and address are free within 24 hours unless you request a force refresh.
Billing and creditsDo my credits expire?
Purchased and bonus credits stay in your account until you use them, with no monthly reset or expiration date.
Trust and privacyDoes verification send a real email to the address?
Verification checks the receiving mail server but stops before transmitting any message body to the recipient.
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Use BillionVerify to clean your list, reduce bounces, and protect your sender reputation.
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