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Upload a CSV of up to 500 email addresses and get five verdicts on every row: deliverability, syntax validity, disposable status, spam association and free-provider detection. The Bulk Email Checker is an online utility inside your APIFreaks account, so there is no code to write and nothing to install. Point it at any list you already hold, whether that is a newsletter export, a CRM dump or a batch of signups, and see which addresses are safe to use before you import or send.
Each row of your CSV comes back as a row in the results table, numbered so you can match results back to your source data. Five signals are returned per address.
The overall deliverability verdict for the address. Four values are possible: valid, invalid, unknown, and risky. This is the column that drives the decision on each row. valid means the address checked out as deliverable. invalid means it was rejected or is undeliverable. unknown means the checks were inconclusive, which catch-all domains and unresponsive mail servers both produce. risky means mail may be accepted but deliverability is not certain, most often because the domain is catch-all. Neither unknown nor risky should be treated as valid: queue those addresses for double opt-in, retry them later, or reject them.
Whether the address is correctly formed. Format is checked for RFC 5322 compliance before any DNS or mail server lookup runs, so malformed entries are identified immediately. When syntax fails, the Valid Email verdict is always invalid, so a broken address never reaches the deliverability checks. A Valid here alongside a non-valid verdict in the Valid Email column tells you something useful: the address is well formed but the mailbox or domain is the problem, so it is a data-quality issue rather than a typo.
Whether the address's domain appears in spam databases. A Yes here is a reputation signal about the domain, not a claim about the individual person. Treat it as a reason to route the row to review rather than to import it into a marketing sequence.
Whether the domain is a free consumer provider such as Gmail, Yahoo, Outlook, or Hotmail, as opposed to a company-owned domain. This is the B2B filter. If you are running a consumer newsletter, this column is noise and you can ignore it.
Export your list as a CSV file (.csv). Only the email column is required, and the header is not case-sensitive, so email, Email and EMAIL all work.
Sign in to your APIFreaks account, select your file in the upload field, and start the run. Each address is checked independently, so one malformed entry does not fail the rest of the batch, and results appear as a numbered table.
The standard workflow, in priority order:
Common jobs, all starting from a list you already hold.
Marketers run their send list through the checker before a campaign goes out. Removing malformed and disposable addresses before the send protects the sender reputation that determines whether the rest of the list sees the email at all.
You take over a CRM, a mailing list, or a product from someone else and have no idea how the contacts were collected. An upload tells you what proportion of the list is structurally broken, disposable, or spam associated before you build anything on top of it.
Sales and growth teams upload a lead export and use the Free column to route company-domain contacts to outbound while holding consumer addresses back. Disposable flags catch form-fillers who never intended to be contacted.
Product teams export a month of registrations and check what the funnel actually let through. A high disposable rate points at a form with no validation on it, which is a fixable problem at the source.
Yes. The Bulk Email Checker runs inside your APIFreaks account because each upload draws on your credit balance. Checking one address at a time needs no account: the Disposable Email Checker is free to use and returns the same five signals for a single address.
Not in this utility. The table returns five signals per address: Disposable, Spam, Free, Valid Email, and Valid Syntax. Catch-all status, role-account detection, full-mailbox status, and MX records are available through the Bulk Email Validation API.