Ensure Email Inbox Delivery & Low Bounce Rates by validating emails with 8 essential validation checkpoints™ to ensure your bulk email campaigns get to the recipient's inbox. Ensure Email Inbox Delivery & Low Bounce Rates. CoolValidator verifies and validates emails with 8 essential validation checkpoints™ to ensure your bulk email campaigns get to the recipient's inbox. 8 Essential Validation Checkpoints: * SMTP Ping Verification * Check existence of SMTP server for domain * Check existence of working mailbox, where accessible * MX Record Validation * Check for improbable names (vulgar, famous, bogus, or suspicious keystroke sequences) * Check mail exchange record of domain is valid and accepting mail * Verify that individual domain specific mailbox rules are met * Check email address syntax and errors