Stop sending to addresses that don't exist.
Every email address is validated automatically when you import leads. SendKit categorizes each address as deliverable, undeliverable, risky, or unknown with confidence scores so you can decide what makes the cut.
Lambda Group
Bad addresses caught on import.
No separate step. Validation happens automatically when leads enter your system.
Deliverable, undeliverable, risky, and unknown. More useful than a simple pass/fail.
Each address gets a confidence score. You choose how aggressive your filtering should be.
Domains that accept everything are flagged so you know which validation results to trust less.
Validation baked into every import.
Upload a CSV or add leads manually. SendKit validates every address automatically during the import process. There's no separate step to remember.
Syntax checks catch formatting errors. Domain and MX record checks confirm the domain receives email. Mailbox-level verification checks if the specific address exists. Catch-all detection identifies domains that accept everything.
Each address is categorized as deliverable, undeliverable, risky, or unknown. Every result includes a confidence score so you can set your own threshold for what enters your campaigns.
Bought a list from a data provider? Validation reveals the real quality of what you paid for. A high percentage of undeliverable addresses means bad data.
Some domains accept email to any address, making it hard to verify individual mailboxes. SendKit detects catch-all domains and flags them so you can decide how to handle them.
ESPs start penalizing you when bounce rates exceed 2%. Validation keeps you below that threshold by filtering out bad addresses before they bounce.
Four categories, not just pass or fail.
Validation that runs automatically, not a step your team forgets
Most platforms make validation a separate action. Someone has to remember to click the button, and they often don't. SendKit validates during import. By the time your leads are in the system, bad addresses are already flagged. Campaigns start clean by default.
Four categories, not just pass or fail
Binary validation misses nuance. An address might be technically valid but risky. SendKit sorts every address into four categories: deliverable (safe to send), undeliverable (don't send), risky (proceed with caution), and unknown (couldn't determine status). Each result includes a confidence score so you can draw your own line on risk tolerance.
Catch-all detection prevents false positives
Some domains accept email to any address, even ones that don't exist. Standard validation marks these as "valid" because the server accepts the connection. SendKit detects catch-all domains specifically and flags them so you know the validation result has lower confidence.
Got questions? We've got answers.
Syntax correctness, domain validity (MX records exist), and mailbox existence. It also detects catch-all domains that accept mail to any address. Each email gets categorized as deliverable, undeliverable, risky, or unknown with a confidence score.
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