You've spent time building an email list, writing your email sequences, and fine-tuning your subject lines. And yet, your campaigns are struggling to take off. High bounce rates, emails ending up in spam folders, and a sender reputation that's gradually deteriorating...
This scenario is more common than you might think. The cause is often the same: invalid, outdated, or malicious email addresses that silently clutter your lists.
Bouncer is an email address verification and validation tool designed to address this very issue. Suitable for sales teams, marketers, growth hackers, and developers alike, it has established itself as one of the market leaders since its launch in 2017.
This guide provides a comprehensive overview of the software: its features, pricing, strengths, limitations, and specific use cases where it can make a real difference.
Bouncer is a SaaS platform for email verification and deliverability. Its purpose is simple: to ensure that the addresses on your list actually exist, are active, and won't compromise your email campaigns.
Specifically, even before an email is sent, Bouncer performs a series of sequential checks to determine whether the address is deliverable, high-risk, undeliverable, or unknown. The tool is designed for a wide range of users:
Founded in 2017, Bouncer has since verified more than 2 billion email addresses and is used by more than 5,000 companies across 6 continents. It is not a niche tool.
That's often the first question people ask. Bouncer operates on a pay-as-you-go credit model: you purchase credits when you need them, with no mandatory monthly subscription. Credits do not expire.
| Volume | Estimated price | Unit cost |
|---|---|---|
| 1,000 emails | ~8 $ | ~0,008 $ |
| 10,000 emails | ~60 $ | ~0,006 $ |
| 50,000 emails | ~250 $ | ~0,005 $ |
| 100,000 emails | ~400 $ | ~0,004 $ |
| 1,000,000 emails | ~2 000 $ | ~0,002 $ |
A few important rules to keep in mind: Bouncer never charges for duplicate addresses or "unknown" results (when the mail server does not respond). This prevents you from paying for checks that could not be completed.
You can also set up automatic monthly top-ups to ensure your checks continue without you having to think about it.
A free account gives you access to 100 free credits so you can try out the platform without having to enter a credit card number. That's enough to evaluate the quality of the results before making any commitment.
Bouncer's interface is designed to be easy to use right away, even for someone who has never used an email verification tool before.
After signing up, you'll be taken to a streamlined dashboard. You have two main options: list-based verification (in batch mode) and real-time verification via the API.
To verify a list: Import your CSV or Excel file directly into the interface using drag-and-drop. Bouncer accepts lists of up to 250,000 addresses per import. Once the file is uploaded, the verification process starts automatically. Depending on the size of the file, processing may take anywhere from a few minutes to a few hours.
At the end of the process, the results are presented in four distinct statuses:
✅ Deliverable: The address is valid and active.
⚠️ Risky: The address exists but shows warning signs (catch-all, role-based address, etc.).
❌ Undeliverable: The address is invalid or does not exist.
❓ Unknown: The server did not respond (not billed).
You can then download only the addresses you want to keep by filtering by status.
Bouncer goes far beyond simple list cleaning. Here's what the platform actually offers, feature by feature.
This is the core of the tool. Bouncer verifies addresses in several successive steps, without ever sending an actual email:
Syntax checking: detection of invalid characters, spaces, and incorrect formats.
Domain verification: Does the domain exist? Are the MX records configured?
SMTP Verification: Bouncer establishes a connection with the mail server to confirm that the mailbox actually exists.
Performance is top-notch: the platform can process up to 200,000 checks per hour per customer, making it one of the fastest tools on the market.
For developers and product teams, Bouncer offers a REST API to validate addresses on the fly—for example, when a user fills out a registration form. The default limit is 1,000 requests per minute, which can be configured as needed.
This is particularly useful for preventing disposable or invalid email addresses from being entered right from the first interaction with your product.
An additional feature that lets you protect your forms in real time, without writing any code. Shield blocks invalid, malicious, or fraudulent email addresses as they’re entered, using IP addresses as a basis for detection. This is a great option for teams that don’t have a developer available to integrate the API.
This is one of the features that sets Bouncer apart from the competition. The tool assigns each email address a toxicity score from 0 to 5 by identifying addresses linked to spam complaints, spam traps, compromised databases, or litigant profiles.
A list may appear clean on the surface but still contain addresses that pose a significant risk to your reputation as a sender. The Toxicity Check goes a step beyond simply verifying that an address exists.
In addition to email address validation, Bouncer offers a suite of tools to improve overall deliverability:
Inbox Placement Test: Checks whether your emails land in the Primary, Promotions, or Spam folders with major email providers (Gmail, Outlook, Yahoo, etc.).
SPF, DKIM, and DMARC Verification: An Audit of the Authentication of Your Sending Domains.
Content analysis using SpamAssassin: detects elements in your content that are likely to trigger anti-spam filters.
Blocklist Monitoring: Alerts if your domain or IP address is added to a blacklist.
This new feature lets youenrich your contacts with company information from public data. It's a handy way to segment or prioritize your lists without using a third-party tool.
Even before checking the entire list, Bouncer can analyze a random sample for free to give you an estimate of the overall quality. If the list is clean, you save credits. If it needs to be cleaned up, you’ll know before committing any resources.
A rather unique feature: Bouncer uses a proprietary algorithm to estimate your campaign’s likely bounce rate before sending. This helps you decide whether or not to include “risky” email addresses, based on the threshold you set for yourself.
Theory is good, but practice is better. Here are five real-world situations in which Bouncer delivers immediate value, whether you're a freelancer, marketer, or developer.
You're taking over a customer account or have an email list that's been inactive for several months. Before sending anything, importing the list into Bouncer allows you to identify addresses that have since been deactivated. Sending to an uncleaned list in this case can cause a spike in bounces that will permanently damage your reputation.
Using the API or Bouncer Shield, you can validate email addresses in real time during sign-up. The result: fewer accounts created with disposable email addresses, cleaner CRM data, and onboarding campaigns that actually reach their recipients.
For a freelancer prospecting for new clients or a sales team using a tool like Waalaxy or Apollo, verifying email addresses before sending is a best practice must-have. A bounce rate higher than 5% on cold emails can be enough to get your domain blacklisted.
A content creator or startup that sends out a monthly newsletter should run Bouncer on its list regularly. Email addresses naturally degrade over time: a quarterly cleanup helps maintain a high deliverability rate and ensures you aren’t paying for emails that never reach their destination.
With the Deliverability Kit, an agency can audit the technical configuration of its clients’ sending domains (SPF, DKIM, DMARC) and identify why their emails end up in spam folders. It’s a value-added service that’s easy to monetize.
Bouncer integrates natively with a wide range of marketing, CRM, and email marketing tools. Among the available integrations are:
For teams that already have a well-defined tech stack, Bouncer can be seamlessly integrated into it. The REST API is also clearly documented for custom integrations.
💡 Set up automatic refills: If you check your email regularly, turn on monthly auto-refills so you never run out of in credits in the middle of a campaign.
💡 Download only valid email addresses: The filtered export lets you retrieve only "deliverable" email addresses without having to manually process the results. This saves a significant amount of time when working with large lists.
💡 Use the toxicity score as a lead qualification filter: Rather than simply removing invalid addresses, applying a filter based on the toxicity score (removing addresses with a score of 3/5 or higher) allows you to take your list qualification a step further.
💡 Use the API in batch mode: For large volumes, the batch API allows you to programmatically submit entire lists and retrieve the results automatically. This is useful for automated workflows.
💡 Check before enriching: If you use a data enrichment tool to supplement your contact list (such as Kaspr or Hunter ), checking the email addresses with Bouncer beforehand will prevent you from paying to enrich addresses that don't work.
Bouncer is sturdy, but it's not suitable for every situation.
The cost can become high for very large volumes when dealing with small organizations. Some users note that the price per credit remains less competitive than tools like MillionVerifier when processing volumes of several million addresses.
The interface's customization options are relatively limited: there are no advanced dashboards or in-depth analysis history for users who want to cross-reference their audit data with other metrics.
The "unknown" result may account for between 0.3% and 3% of your list, depending on its size. You are not charged for this, but it means that a portion of your addresses remains in a gray area.
When verifying emails in real time under very high traffic conditions, experienced technical teams will note that the rate of unknown emails is slightly higher than in batch mode (about 5% higher), which is documented and expected.
| Profile | An alternative to consider |
|---|---|
| Are you looking for a tool with built-in data enrichment? | -ZeroBounce |
| You have a very large order and are looking for the lowest price | MillionVerifier |
| Do you want deep, native integration with email service providers (ESPs)? | NeverBounce |
| You need validation + inbox activity data | ZeroBounce |
Before you get started, here are the most frequently asked questions about Bouncer, along with straightforward answers.
Yes. The data processed by Bouncer is hosted in data centers located in Europe, and email addresses are hashed (anonymized) throughout the system. The results are automatically deleted after 60 days, or upon request.
The platform claims an accuracy rate of approximately 99.5%, with one of the lowest rates of "unknown" results on the market (0.3% to 3%, depending on the list).
Yes, with Bouncer Shield. This feature can be added to your forms without any code and blocks invalid email addresses as they're entered.
No. Purchased credits do not expire, so you can use them at your own pace without any pressure.
Yes. Bouncer identifies catch-all domains (which accept all emails regardless of whether the mailbox exists) and classifies them as "risky." The Bounce Estimate feature then allows you to estimate the impact of these addresses on your campaigns.
The pay-as-you-go model does not require a subscription, so there is nothing to cancel. Unused credits remain available indefinitely.
Both. The entry-level plan, offering 1,000 checks for $8, is accessible to freelancers and entrepreneur. The advanced features (API, Deliverability Kit, Toxicity Check) will be used more extensively by teams handling larger volumes.
The system automatically identifies them during the domain verification process. These addresses are classified as undeliverable or high-risk, as appropriate.
Bouncereffectively fulfills its primary purpose: cleaning email lists accurately, quickly, and without unnecessary technical complexity. Its subscription-free “ in credits ” model makes it particularly well-suited for entrepreneurs and teams who don’t want to commit to a fixed monthly plan.
The Toxicity Check and the Deliverability Kit set it apart from a simple email address validator: it’s a tool that focuses on the overall health of your deliverability, not just the validity of an email address.
Whether you manage an email list, engage in outbound marketing, or focus on inbound marketing, regularly cleaning up your contact list is an investment that quickly pays for itself through savings on your email marketing tools and improvements in your open rates.
