2 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
Is this a seznam address (seznam.cz, email.cz)? Matches the domain part against seznam's consumer mailbox domains and reports personal-vs-business, so CRM and lead rules can treat free-webmail signups differently. $0.01...
Bulk is seznam address: up to 20 emails in one call, processed concurrently, results in input order with a per-item error field and a failure count. Same answer per item as the single endpoint. Batch enrichment for agent...