Analyze email list quality from a CSV upload. Check format validity, detect role addresses, disposable domains, and duplicate entries.
Email List Health Checker takes a CSV of email records and surfaces four kinds of list-hygiene issues: values that fail its email-format check, role-based mailboxes such as support@ or sales@, addresses using recognized disposable-email domains, and repeated entries. It is a screening report, not an SMTP delivery test. The common mistake is treating an unflagged address as verified. Passing these checks does not show that the mailbox exists, accepts messages, belongs to the named contact, or gave marketing consent. The CSV is processed in the browser rather than uploaded.
The uploaded CSV supplies a batch of email values for one pass. The checker evaluates those values against the four named issue types, exposing patterns that are difficult to spot row by row, especially in files assembled from multiple sources. Because the analysis stays in the browser, the addresses do not need to be sent to a remote validation service.
A format failure, role label, disposable-domain match, and duplicate are different findings. A role address can be syntactically valid, and a duplicate can also be deliverable. Likewise, a value with no listed flag has only cleared these screens. Read each category as a reason to review or segment a row, not as a universal instruction to delete it.
No. It means the rows did not trigger the checks reported by this tool. Delivery can still fail because a mailbox was closed, a domain is misconfigured, a receiving server rejects the recipient, or the sending system suppresses the address. Bounce rate also reflects sending practices and list age, neither of which can be established from address text alone.
No. An address such as support@ or sales@ may be a legitimate, monitored destination even though it represents a function rather than a named person. Keep, suppress, or segment it according to the campaign's purpose, permission records, and sender policy. The role flag describes the mailbox pattern; it does not establish that the address is invalid or unwanted.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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