Lemlist suspends accounts when bounce rates spike. BounceZero removes invalid addresses before you hit send - keeping your campaigns live and your domains healthy.
100 free verifications/month - No credit card required
Lemlist actively monitors deliverability across its platform - and it protects itself. Bounce spikes don't just hurt your reply rate; they can pause your campaigns or suspend your account entirely.
To protect its shared sending reputation, Lemlist pauses campaigns and can suspend accounts when bounce rates climb. One dirty import can take your whole outreach operation offline mid-sequence.
Around 22% of email addresses go dead every year as people change jobs. The prospect list you built for last quarter's Lemlist campaign is already carrying invalid addresses into this one.
Lemlist's custom images, liquid syntax and multichannel steps take real effort per prospect. Every invalid address burns that work - plus a reputation hit - on an inbox that no longer exists.
Each address runs through six verification layers with up to 99.8% accuracy in internal testing on SMTP-verifiable addresses - well above the industry benchmark of ~95%.
Live SMTP-level confirmation that the inbox actually exists - the single biggest predictor of a hard bounce in your Lemlist campaign.
Roughly 23% of B2B domains accept mail for any address. Our triple-probe test separates genuinely deliverable addresses from catch-alls that bounce later.
Flags info@, sales@ and admin@ addresses that never respond to personalized outreach and frequently trigger spam complaints.
Removes temporary and throwaway inboxes that inflate your Lemlist lead lists while contributing zero replies or pipeline.
Confirms the domain can actually receive mail before Lemlist wastes a personalized send - and a reputation hit - on it.
Identifies known and suspected spam traps that can get your sending domains blocklisted in a single campaign.
Ten minutes of verification protects your Lemlist account, your domains and weeks of warm-up. Here's the workflow Lemlist users run with BounceZero.
Pull your leads as CSV from your data source - Apollo, Clay, Sales Navigator scrapes, purchased lists - or export an existing lead list from a Lemlist campaign.
Drag your CSV into the bulk verifier. Up to 1,000,000 addresses per dashboard job - a typical 10K cold email list finishes in 5-10 minutes.
Mailbox existence, 3-probe catch-all, role, disposable, MX and spam trap detection run on every address at up to 99.8% accuracy in internal testing on SMTP-verifiable addresses.
Get your list back split into deliverable, risky and invalid. Keep the deliverable segment; quarantine or drop the rest.
Upload only verified addresses to your Lemlist campaign. Your bounce rate stays under 0.5% - well inside Lemlist's deliverability thresholds - and your account stays live.
A suspended account means paused sequences, stalled pipeline and support tickets. A burned domain means 2-3 weeks of re-warm-up. Verification costs a fraction of either.
Common questions from cold email teams verifying lists before Lemlist.
Yes - via a simple CSV workflow or our API. Export your leads, upload them to BounceZero, and import the cleaned deliverable segment back into your Lemlist campaign. For automated pipelines, our REST API (provider-dependent response time) can verify leads programmatically before they ever reach a Lemlist lead list.
Lemlist protects the deliverability of its whole platform, so campaigns with elevated bounce rates get paused and repeat offenders risk account suspension. Verifying with BounceZero first keeps cleaned lists under a 0.5% bounce rate - comfortably below the levels that trigger enforcement.
Always before. Once Lemlist sends to an invalid address, the bounce has already damaged your sending domain's reputation - and moved you closer to a campaign pause. Verifying first means only deliverable addresses ever enter your sequences.
Around 23% of B2B domains are catch-all, and basic checkers mark them all "valid". BounceZero's 3-probe catch-all detection scores how likely each one is to actually deliver. Send to high-confidence catch-alls from a secondary domain, and keep unverifiable ones out of your primary Lemlist campaigns.
A 10,000-email list finishes in about 5-10 minutes through the bulk verifier, and single dashboard jobs scale up to 1,000,000 addresses. You can export from your data source, verify, and load a clean list into Lemlist within the same working session.
$3 per 1,000 verifications - so a 10K-lead Lemlist campaign costs about $30 to clean. Every account also includes 100 free verifications per month with no credit card required, so you can test accuracy on your own list before paying anything.
up to 99.8% accuracy in internal testing on SMTP-verifiable addresses. $3 per 1,000 verifications. Results in seconds. Start with 100 free verifications - no credit card required.
Verify your list before loading it into your sending platform
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