Mailercloud Email Verifier - Verify up to 1M emails with live SMTP checks — from $5
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Mailercloud Email Verifier checks every address against live mail servers via SMTP — not just DNS lookups. Verify up to 1M emails in bulk, paste up to 50 with Quick Verify, or plug in the API. Catch invalid, disposable, catch-all & role-based addresses, and get a 0–100 Delivery Score for each. Reduce bounces, protect your sender reputation. From $5 for 1,000 credits — credits never expire.
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Finally gave the API a shot and was surprised how cleanly the docs are laid out, fired off a test OTP in maybe ten minutes flat. Deliverability on the campaign side looks solid so far.