Email Verification
Checking that addresses on a list are real and deliverable before sending — the single biggest lever on bounce rate and sender reputation.
Email verification validates each address on a list — confirming the domain exists, the mailbox is real, and the address is not a known trap — before any campaign goes out. Because mailbox providers judge senders partly on how many messages bounce, scrubbing a list first is the most direct way to protect deliverability.
Verification typically flags addresses as valid, invalid, risky, or catch-all, and disciplined senders suppress everything but clean valid addresses on cold sends. Skipping this step is a fast path to a high bounce rate, which damages domain reputation and pushes even good messages to spam, so verification is treated as mandatory pre-send hygiene rather than an optional polish.
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