Lookproof Bulk Mail Configuration Checker

Use this endpoint when you need to audit email configuration (MX, SPF, DMARC) for multiple domains simultaneously — especially for customer lists, brand portfolios, or onboarding pipelines. It is far more efficient than calling a single-domain check 20 times, and the built-in retry token mechanism handles transient DNS failures gracefully. Prefer this over single-domain checks whenever you have 2 or more domains to audit in the same workflow.

• Domain unreachable or non-existent returns an error result with a retry token
• More than 20 domains submitted causes a validation error
• Invalid domain string format causes rejection of that item
• Temporary DNS resolver failures produce technical error results with retry tokens
• Network timeout on bulk requests may result in partial results with retry tokens for failed items