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Single email validation (POST /v1/email/single-validate) is designed for individual validation requests — one email address per request, triggered as part of your application’s normal flow (e.g. validating an email at signup).
Sending large numbers of sequential or concurrent requests through the single-validation endpoint — for example, looping over a list of emails — may trigger rate limiting.
If you need to validate many email addresses at once, use bulk validation instead once it becomes available. See Bulk Email Validation.
Bulk validation is currently under development. Until it’s available, keep single-validation calls scoped to individual, user-triggered requests rather than batch processing.