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Award-Winning Email Validation Service.

Editor's Overview

ZeroBounce gives its competitors run for their money; by its accurate email verification solutions. ZeroBounce has earned 23500+ active accounts with its data append facility at no extra cost and 24*7*365 dedicated customer support.


  • 97.47% accuracy (Highest in Industry)
  • Greylisting feature.
  • Military grade security.
  • 24*7*365 customer support.


  • Limited integration option with ESPs.
  • Takes longer to deliver the results.

  ZeroBounce - Ranked 21st in Pricing

  • Cost of verifying 2k to 100k emails is as low as $0.0065.
  • The minimum order value is $16 for 2000 credits. The credit never expires.

Top 10 Most Affordable Email Verification Vendors

(Cost for 10k Email verification)

See All Affordable Email Verification Vendors

ZeroBounce - Ranked 1st in Accuracy

  • ZeroBounce guarantees 96% accuracy on AOL, Yahoo and office 365 email accounts and 98% accuracy on all other e-mail accounts.
  • ZB Guarantee - If the accuracy rates are below the guaranteed thresholds, ZB will refund five times the amount for each 1%. Let's say you have a 97% accuracy rate, which is 1% below the guaranteed threshold of (98%+ Accuracy rates on everything else). It will refund 5 x 1% (or 5%) of your total validation cost for those emails. If your accuracy rate is 2% below the guaranteed threshold, they will refund 10% of your expenses. If it's 4% below, the refund will be 20%, and so on.
  • ZeroBounce tops the ranking table by accuracy performance since our last two audits.
Claimed By ZeroBounce

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Top 10 Most Accurate Email Verification Vendors

ZeroBounce - Multiple Different Validations

ZeroBounce Accuracy Vs. Avg. Industry standards

ZeroBounce Accuracy Industry Average
Gmail 100 89
Yahoo 95 95
AOL 92 81

ZeroBounce - Ranked 15th in Turnaround time

  • ZeroBounce can processes 10,000 email addresses in under 6 minutes.
  • ZeroBounce gives quick analysis, which shows the overall health of the uploaded file within 6 to 7 minutes.
  • ZB consumes more than 30 minutes to deliver the resultant file. Time taken is on the higher side as it uses Greylisting feature.

Claimed By ZeroBounce


Top 10 Fastest Email Verification Vendors

(Turnaround Time per Emails)

ZeroBounce - Ranked 14th in Free Trial

  • ZeroBounce provides free 100 email credits per month. (Professional email account is required)
  • For free trial credit card is not required.

Daily 5 verifications available without signup

One Time 100 verifications available after signup

Credit card Not Required

Integration Options

  • ZeroBounce offers a limited number of integrations.
  • ZeroBounce integrates with leading ESPs like MailChimp and Constant Contact.

Advance Features

  • Bulk Email Validation API ZeroBounce has developed bulk email validation API which allows frequent customers to validate the emails without any manual process involved.
  • ZeroBounce has received following certifications and accreditation, Cyber Smart Defence, PCI Compliance, ISIPP, ReturnPath, Certified Senders, EU GDPR Compliant, Privacy Shield Framework, BBB Accredited Business.

Major Clients

client1 client2 client3 client4 client5 client6 client7 client8

Sign up process

  • Email verification is mandatory for completing the sign-up process.

App installation required?

  • ZeroBounce is a SaaS-based platform, which does not require any download or installation.

Formats for file Upload

  • You can upload your email list in .csv or .txt formats.
  • If you upload a .csv file with a first name column, their system will use that information to find the gender of that email.
  • Email list containing more than 20% mal-formed or blank emails will not be accepted.

Format for file Download

  • Password protected encrypted zip file is given to download the results. A unique key will be sent on the registered email address for un-zipping the file.
  • The zip file will have files in CSV format viz. all results, abuse, catchall, do not mail, invalid and the original file
  • You will also have a PDF file containing an executive summary of the results.
  • ZeroBounce stores result only for 30 days.

Customized / scalable services

  • ZeroBounce offers customized/scalable services.
  • All you need to do this, contact their support team and explain your requirement.
Request a quote

Customer Support

  • Apart from the prominent services, their support is commendable.
  • They provide 24/7 support via Email and Live Chat.
    They also provide support via phone during business hours, i.e. Mon-Fri (9am-5pm).
Claimed By ZeroBounce
Live Chat
Live Chat
  • Average
  • Good
  • Excellent
  • Not available

Real-time verification through API

  • ZeroBounce provides API support for avoiding incorrect email addresses from signing up on your mailing list.
  • Different languages like PHP, Python, JQUERY, .NET, Java is supported for API.
What Email Verification solution do you use?
How likely is it that you would recommend Verify to a friend or colleague?

ZeroBounce Reviews


Irene Iris said "amazing service, I would use it everytime I need to validate emails."


Robil Hossain said "Compare various Email Verification service providers and select the best one for your requirement"

Does not Recommend

James P. said "We're using Zerobounce since last 3 months. Best part of their service is their accuracy and speed. We're almost receiving 98%+ accuracy with every validation we do with Zerobounce."


Makailol Charls said "Accuracy of Zerobounce is not as good as it is mentioned on their website."

Does not Recommend

Freya De Vries said "The best!! 24/7 support, fast and accurate, the perfect email validation service!"


Vlad Stoian said "Great service, very accurate and reasonably priced, very good service and I recommend it highly for their standards in quality and care given to the customers."


Adrian Littera said "Best e-mail verification service available. Very pleased."


George Nmn said "best email validator, greast customer service , cheap prices"


Straton Dan-Andrei said "The best email validation software. High accuracy. Professional team. Great services."


Alexandru Ghitan said "Fast, easy to use and accurate results! I definitely recommend ZeroBounce!"


Anca Vasile said "ZeroBounce it is the best email validation service"


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From the business

About - ZeroBounce

Established in 2017.

ZeroBounce is among the most prominent vendors in terms of accuracy. Setting it apart from competitors, ZeroBounce complements the incredible email verification service through performance analytics and adding missing data to your email address list [such as subscriber's first and last name, gender, city, state, country and IP registration information at no extra cost].

An equally impressive feature we found during our audit was seamless 24*7 customer support, available to customers around the clock. With its highly secured data cleansing process, ZeroBounce has acquired some pretty big-time clients; namely Siemens, Tripadvisor, Shopify, Comodo, Allstate etc.

Although ZeroBounce is the premier email validation service, it has fallen behind by not providing ESPs integrations. $35 is the minimum payment amount that ZeroBounce charges for 5000 credits. The credit never expires. But if you were to verify a smaller volume, there are other alternatives you can elect for. Certainly deserving of first place by accuracy, ZeroBounce ranks lower in cost per email verification.

ZeroBounce - Data Protection

ZeroBounce uses “Cloudflare” for surefire content delivery which ensures additional defense against cyber attacks and data breaches. ZB is one of the only email verification services that uses a military grade encryption algorithm to safeguard YOUR files and YOUR personal information.

ZeroBounce ensures data security by encrypting the files as well as protecting them through a password during the process of email verification. Only the registered user will have access to the files. ZeroBounce will never store any data in their system. After the email verification is completed, all the data and related aspects will be erased in maximum 30 days.

ZeroBounce - Privacy Policy

ZeroBounce complies with the EU-U.S. Privacy Shield Framework and the Swiss-U.S. Privacy Shield Framework as set forth by the U.S. Department of Commerce regarding the collection, use, and retention of personal information transferred from the European Union and Switzerland to the United States, respectively.

ZeroBounce - Hosting locations

ZeroBounce hosts its Email verification servers in the European Union.

Anti - greylisting technology

ZeroBounce allows for an comprehensive, 37 minute verification process for the email list because it deploys the anti-grey-listing technology. A lot of remote mail servers will issue a 421 response code initially, then after a period of time up to 30 minutes, they will allow the email address to be validated appropriately.

If any file has an email address that encounters a single 421 response on, it will delay the entire file processing time by up to 35-37 minutes.

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