Cloud validation services store your lists for 30 days. Your competitors use the same services. BounceBuster keeps everything local - your lists never leave your machine.
When you upload a prospect list to ZeroBounce, NeverBounce, or Hunter.io, that list is stored on their servers. Typically for 30 days, sometimes longer. That's 30 days where your carefully curated prospect data exists on infrastructure you don't control.
The cold email space is competitive. Thousands of outreach teams use the same validation services. While services claim to keep data segregated, the risk is structural: your most valuable asset (your prospect lists) sits on shared infrastructure alongside your competitors' data.
NeverBounce is owned by ZoomInfo - a company whose entire business model is aggregating B2B contact data and selling it. When you upload prospect lists to NeverBounce, you're sending data to a company in the business of collecting exactly that kind of information.
Cold outreach requires clean lists at scale. At $0.005-0.015 per email, validating 50K prospects costs $250-750. Do that monthly as you build new lists, and you're spending thousands per year just on validation.
BounceBuster runs on your machine. Your prospect lists are never uploaded, never stored on third-party servers, and never accessible to anyone but you.
Drag and drop your CSV or Excel file. BounceBuster reads it locally, validates each email, and writes results to a local file. No internet upload required.
Your prospect lists never touch shared cloud infrastructure. There's zero chance of your data being accessible - accidentally or otherwise - to other users of the same service.
Validate 10K or 100K prospects for the same price. No credits, no tiers, no monthly fees. Build and clean as many lists as you want.
BounceBuster processes thousands of emails per minute using parallel DNS and MX lookups. No API rate limits, no queue waiting.
No sign-up, no API keys, no vendor relationship. Download, install, validate. Your outreach stack has one fewer dependency.
Format + DNS + MX validation catches roughly 90% of invalid emails. Fewer bounces means better sender reputation and higher inbox placement rates.
If you validate 50K emails per month (a typical cold outreach volume), here's what you'd spend annually:
| Service | 50K/month | Annual Cost | Data Uploaded? |
|---|---|---|---|
| ZeroBounce | $260 | $3,120 | Yes |
| NeverBounce | $300 | $3,600 | Yes (to ZoomInfo) |
| Hunter.io | $399 | $4,788 | Yes |
| Mailgun | $90 | $1,080 | Yes |
| BounceBuster | $19 total | $19 total | Never |
BounceBuster is a one-time $19 payment. No per-email charges, no monthly fees, no usage limits.
BounceBuster validates email format, DNS records, and MX records. It does not perform SMTP verification (which checks if a specific mailbox exists). SMTP checks can catch an additional ~10% of invalid addresses, but they require sending each email address to the destination server - which is exactly the kind of data transmission we avoid. For most cold email campaigns, format + DNS + MX validation removes the invalid addresses that cause hard bounces and damage sender reputation.
Download BounceBuster and validate your cold email lists locally. No uploads, no cloud storage, no per-email fees. $19 once for unlimited validation.