Bounces in QuickMail hurt every inbox in your rotation simultaneously. BounceZero pre-verifies your contacts so your entire sending pool stays in good standing.
QuickMail's inbox rotation spreads your volume across multiple sending accounts. That's great for scale - until a dirty list spreads bounce damage across all of them at once.
When QuickMail rotates a campaign across 5 inboxes, a 10% bounce rate doesn't hurt one sender reputation - it hurts five. Each inbox in the pool takes reputation damage from the same dead contacts.
You spent weeks warming each sending account. A single blast to an unverified list can undo that warm-up in a day, and swapping in a fresh inbox means starting the warm-up clock from zero.
People change jobs, companies churn domains, and mailboxes get shut down. Roughly 22% of email addresses go stale annually - the list that was clean last quarter is quietly bouncing today.
Every address runs through our full verification pipeline before you import it back into QuickMail - so only deliverable, safe contacts enter your sending pool.
We connect to the recipient's mail server and confirm the mailbox actually exists - the single biggest predictor of a bounce.
Around 23% of B2B domains accept everything, then bounce later. Our 3-probe test separates real mailboxes from catch-all traps.
info@, sales@ and admin@ addresses rarely reply and often trigger spam complaints - we flag them so you can exclude them from cold outreach.
Temporary inboxes from throwaway providers are dead weight in a cold email list. We catch them before they enter your rotation.
If the domain has no valid mail exchanger, nothing you send will ever land. We verify DNS-level deliverability for every domain.
One spam trap hit can blocklist every inbox in your QuickMail pool. We screen against known trap patterns and recycled addresses.
The whole loop takes minutes. Verify once, import clean, and every inbox in your rotation sends to real people.
Export contacts as CSV from QuickMail, or straight from your lead source - Apollo, LinkedIn scrapes, purchased lists, or your CRM.
Drag and drop your CSV into the BounceZero dashboard. We handle up to 1,000,000 addresses per dashboard job - most cold email lists finish in 5-10 minutes.
Every address gets mailbox existence, catch-all, role, disposable, MX and spam trap checks at up to 99.8% accuracy in internal testing on SMTP-verifiable addresses.
Get your results segmented into valid, invalid, catch-all and risky. Export only the valid contacts - leave the rest out of your campaigns.
Import the cleaned CSV into your QuickMail campaign. Your inbox rotation now distributes volume across contacts that actually exist.
Lists decay ~22% per year. Re-run older segments through BounceZero before major sends, or wire up our API to verify continuously.
Verification costs a fraction of what you already spend on QuickMail seats, warmed inboxes and lead data - and it protects all of them.
Everything QuickMail users ask us about verifying their lists.
Yes - via a simple CSV workflow. Export your prospects, upload to BounceZero, download the cleaned list and import it back into your QuickMail campaign. For automated pipelines, use our REST API (provider-dependent response time) to verify emails before they ever reach QuickMail.
QuickMail distributes the same list across all inboxes in your rotation. If the list contains dead addresses, every inbox sends its share of bounces - so a single dirty list degrades the sender reputation of your entire pool simultaneously, not just one account.
Under 2% is the widely accepted safe threshold for cold email; above 5% you risk mailbox providers throttling or blocking your inboxes. Lists cleaned with BounceZero typically bounce below 0.5%, keeping your whole rotation comfortably inside the safe zone.
Around 23% of B2B domains are catch-all - they accept every address, then may bounce or ignore later. BounceZero's 3-probe catch-all detection identifies them so you can send to catch-alls from a lower-priority inbox segment, or exclude them entirely from your main rotation.
A 10K list finishes in about 5-10 minutes through bulk upload, and we support up to 1,000,000 addresses per dashboard job. Single-email API checks return with timing that varies by provider and verification path, so real-time verification inside a lead pipeline is also practical.
Email data decays roughly 22% per year as people change jobs and domains churn. Re-verify any list older than 60-90 days before a major send, and always verify freshly purchased or scraped data before its first import into QuickMail.
Verify your list before your next campaign. 100 free verifications every month, up to 99.8% accuracy in internal testing on SMTP-verifiable addresses, no credit card required.
Verify your list before loading it into your sending platform
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