Free email checker: start with structure

The free RefreshList checker inspects common address structure locally without contacting a mailbox. It finds obvious malformed input, but accepted structure does not prove an inbox exists. Actual verification is available through the signed-in workspace’s one-time ten-check trial when the provider is configured, with unknown outcomes kept explicit.

Last updated 2026-09-14. Read the scope and limitations before applying a result.

Key points

Local checking costs zero.
No mailbox contact here.
Trial outcomes may be unknown.

Detailed explanation

Use local validation to catch obvious entry problems. The trial is a separate authenticated provider-backed workflow, not a simulated answer.

Example

A missing @ is rejected; a plausible address is labeled structure accepted and mailbox not checked.

How RefreshList handles it

The local rule is shared with CSV preflight. Trial attempts, according to the selected results, consume trial checks.

Limitations

Advanced valid syntax and subtle typos may not be recognized. Disposable and catch-all status are not checked by this form.

Methodology and sources

Product behavior is described from the current RefreshList implementation and provider contract. Protocol context should be checked against the applicable standards and provider documentation. This page does not create a benchmark or certification.