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Bulk Email Address List Verification, Validation, and Cleansing Platforms and APIs

Email marketing is a blood sport. In the last 20 years, the only thing that’s changed with email is that good email senders continue to get punished more and more by email service providers. While ISPs and ESPs could totally coordinate if they wanted to, they simply don’t. The result is that there’s an adversarial relationship between the two. Internet Service Providers (ISPs) block Email Service Providers (ESPs)… and then ESPs are forced to block clients.

If over 10% of your emails are bad, less than 44% are delivered!

It’s not as simple as double opt-in in the industry. Sites like ours work with partners on shared campaigns with vendors and clients. We don’t give them access to our list, but many times we collect email addresses together to execute campaigns. That’s been a huge headache. Email service providers don’t care about your opt-in methodology or your audit trail; they simply assume you’re a spammer.

ESPs like Mailchimp have implemented intelligence on email addresses in a system called Omnivore. With Omnivore, Mailchimp sent 50,000 warnings and shut down 45,905 malicious accounts in one year alone. They may promote the fact that those accounts were malicious… I’d argue that many of them were simply companies sending to their lists and not using best practices.

According to Jupiter Research, more than 20 percent of email registrations contain typos, syntax, domain, and other errors. Doing something as simple as sending to an old list where a particular threshold of email addresses bounces can set off their threshold. That’s not malicious. Not to mention bots out there pushing SPAM trap email addresses through systems every day to try and catch you. The irony, in my opinion, is that I believe it’s easier for a SPAMMER to get an email into your inbox than the average company sending a valid message.

Email Service Providers aren’t too honest about their deliverability rates, either. Often, they’ll tout a 99% deliverability rating, but the small print states that it’s after a few campaigns. Well, duh… the first send captures the invalid email addresses! The average acceptance rate for a Sender Score of 91 or greater is 88%. Having 1% of your list bad can drop your deliverability by over 10%!

Thankfully, there are email verification and list hygiene providers on the market who gather intelligence and will help you clean your lists before getting caught up in this mess. Keep in mind that there’s a huge difference between email validation versus email verification services. Email validation verifies that the email address is properly constructed, while email verification utilizes methodologies to predict its likelihood to be delivered.

Why Do You Need Email List Cleansing?

Email hygiene is a necessary step in having a great email deliverability program and maintaining a good sender reputation. Here are 4 scenarios where email list cleaning is a necessity:

  1. Migration – If you’re moving to a new provider, email list cleaning is an essential step in your IP warming strategy.
  2. Low Inbox Placement – Your emails may be going directly to the junk folder because your list has so many spam traps and bounced email addresses on it.
  3. Low Open Rates – If you’re not measuring your inbox placement rate and have low open rates, your emails may be going to the junk folder due to so many spam traps and bounced email addresses.
  4. Re-Engagement – If you have a list that you haven’t sent to in months, you will want to cleanse the list to avoid a spike in bounces that may impact your deliverability rates.

How to Choose An Email List Cleaning Service

This page has become incredibly popular, so we want to ensure we provide some guidance in selecting a provider and why we segmented the list below into recommended and unknown email list hygiene services. Our recommendations were based on the following:

  • Terms – does the service have terms and a privacy policy in place that ensures that they do not resell or release your email addresses to any third party?
  • Transparency – is the service registered openly online with contact information for their domain ownership, business location, and contact information? Is the business a dedicated office space (and not a PO Box or shared office)?
  • Support – whether or not the company had a means of contacting them via email, a contact form, or phone number and did anyone actually respond to the request.
  • Integrations – bulk processing of email addresses is one thing, but if you can integrate all of your systems and entry points where you’re collecting email addresses, that’s a far more efficient process. 
  • API – do they have a well-documented API where you can integrate your own platforms directly with them?
  • Compliance – whether or not the company resides in a country with privacy regulations such as GDPR or email spam compliance legislation.

Our Email List Cleaning Sponsors:

Full Service

If you would like your email list cleansed by my firm, please let us know. We have competitive pricing and provide additional email information.


Upload List

MailerCheck offers email verification, analysis, and list cleaning designed for people who want a quick and reliable tool without all the fuss and upsells. Just 3 simple steps to optimize your list.



A simple JSON API you can integrate into any platform to verify the existence, validity, and quality of any email address simply by passing it into the request URL.


Leading Email List Cleaning and Hygiene Providers

Here are the leading email verification and list hygiene services. All of these include an online platform where you are not required to contact a sales team and they all have terms on data usage, are transparent, and actively responded to support requests:

Utilization of these list hygiene services can improve the percentage of emails that make it to the inbox, reduce your risk of being blocked by the Internet Service Providers, and reduce the risk of getting fired by your Email Service Provider… they’re worth the investment if you’ve got an old list or are collaborating on one. Keep in mind that you’ll simply never reach 100% accuracy on your lists. People change jobs and providers often, abandoning their old email addresses.

Most of these providers also offer an API so that you can integrate it into your acquisition process.

  • Aeroleads – find business emails and phone numbers of prospects. They have a chrome extension also.
  • Bouncer – User-friendly email verification and list cleaning tool that help you maintain communication and reach out to a real person with ease and promptness.
  • BriteVerify – (now part of Validity) tools you need to remove invalid emails from your customer databases, email marketing campaigns, or online newsletters and keep them out for good. You can easily drag and drop a file, share the file via the cloud, and get detailed reporting on your list without ever contacting the company. They also have an API if you’d like to integrate your email verification with them!
  • Clearout – This bulk email verifier enables you to upload the email database and clean up your email list with just a single click. 
  • DeBounce – DeBounce service allows you to upload and validate lists of email addresses quickly and in a secure way.
  • Email Checker – (different from above) Email Checker is one of the original pioneers within the email verification sector, helping to improve the deliverability of email communications.
  • Experian Data Quality – an email verification solution that instantly identifies whether an email address is valid and deliverable.
  • FreshAddress helps companies that depend on email to drive revenue by building, updating, segmenting, and cleaning their email lists.
  • Impressionwise‘s data intelligence platform is based on policy-driven rule sets and real-time scanning algorithms that use a multi-layered approach to identify, validate, and protect against a wide range of email-based threats.
  • Informatica – Quickly and effortlessly verify and validate email addresses and domains to ensure their accuracy before you spend unnecessary time, energy, and money, increasing your message deliverability by 90%.
  • Kickbox – Kickbox ensures you only send emails to real users and helps you separate low-quality addresses from high-value contacts. Protect your reputation, increase open rates, and save money with Kickbox.
  • Mailboxlayer – Verify the existence, validity, and quality of any email address simply by passing it into the request URL.
  • MailerCheck – Email verification, analysis, and list cleaning designed for people who want a quick and reliable tool without all the fuss and upsells. Just 3 simple steps to optimize your list.
  • MillionVerifier – Email verification with guaranteed high accuracy and affordable rates.
  • NeverBounce eliminates invalid email addresses and dramatically reduces overall bounce rates for maximized deliverability. 
  • Proofy – Quickly validate and verify your email lists. EU-US Privacy Shield compliant.
  • – Cold outreach automation – find, validate, and email prospects with Snovio for better conversion rates.
  • TheChecker – 1,000’s of professionals from 80+ countries rely on our bulk email verification and email list cleaning services.
  • TowerData – Increase your inbox delivery rate by cleaning your email list of invalid and fraudulent email addresses.
  • Xverify – Know you are emailing an account that will not bounce. Xverify can verify email addresses in real-time and via batch.
  • Webbula – Email hygiene and data enhancement services.

Other Email Verification Services Online

Here are other email verification and hygiene services that did not have all of the trust indicators of the companies above.

  • Ampliz – Ampliz verifies your customer email addresses in real-time and helps you to maintain email hygiene delivering maximum response rate. This domain is also registered to the Bounceless service. Bounceless will clean your email lists by detecting unverified emails, spam traps, and disposable domains.
  • Antideo – Email Validation API service to weed out Disposable / Temporary email addresses, spam emails, etc, to keep your lists clean.
  • Block Disposable Email Addresses – Detect and block disposable, one-time, throwaway, temporary email addresses.
  • Bulk Email Validator – a web application that can verify if an email address is real or fake. Anyone who sends emails regularly can benefit from using the system.
  • CaptainVerify – check & clean your mailing lists quickly. Drag and drop your file in our tool and we do the rest. Simple, fast and secure.
  • ContactOut – Find anyone’s personal email address as well as phone number
  • DataValidation – Validate your email list fast. Link a Mailchimp or Constant Contact account for ongoing monitoring and list maintenance.
  • Emailmarker – Emailmarker helps you filter low-quality emails from high-value contacts. We ensure you only send an email to real users and protect your reputation, Boost your email campaign, and save money with Emailmarker.
  • eHygienics is a professional email verification company. They remove bounces, threats, protestors, litigators, and all other perceivable hazards from subscriber databases. eHygienics offers real-time API platforms which are used daily by subscribers worldwide.
  • EmailHippo – Email validation online service for professional marketers and their clients
  • EmailInspector – Cleanse and remove invalid email addresses from your marketing lists
  • – Automate your email validation process by validating contact information with their intuitive email checker.
  • Email List Verify – Email list verified protects you from penalties by offering the most comprehensive email verification solution on the market, making sure that your email lists are bounce-free, valid, and delivering high ROI.
  • Email Validator – With the Byteplant Real-Time Online Email Validator you can easily verify if an email address exists and is valid.
  • Klemail – Klemail allows you to check that the emails you send exist. Protect your domain’s reputation and increase your open rate.
  • ListWise – We analyzed the results of the hundreds of millions of email addresses we have cleaned to design a new email list-cleaning engine that is more powerful than ever. Try ListWise II for free and take your email marketing performance to new highs
  • MailboxValidator – connects to the mail server and checks whether the mailbox exists or not
  • Mailcheck – validates emails and phones using social networks
  • Mastersoft Group – focused on Australian data
  • Quick Email Verification – A web-based service to verify email addresses in bulk or real-time using a REST API. They detect invalid and non-working emails and provide you with a complete detailed report.
  • SiftLogic – Email Verification & Scoring to help inbox placement and maximize sender reputation.
  • Truemail – Email Verification. Easy, Fast & Cheap. Clean your mailing list and increase your deliverability rate by up to 99%. The email address validation process was never so easy.
  • Verifalia – Verifalia is a web-based email validation service that lets you upload and validate lists of email addresses simply and easily.

Disclosure: We do not take any responsibility for your success in selecting one of these providers, we just wanted to provide a comprehensive list with some additional trust verifiers. We are using affiliate links within this article.

Douglas Karr

Douglas Karr is the founder of the Martech Zone and a recognized expert on digital transformation. Douglas has helped start several successful MarTech startups, has assisted in the due diligence of over $5 bil in Martech acquisitions and investments, and continues to launch his own platforms and services. He's a co-founder of Highbridge, a digital transformation consulting firm. Douglas is also a published author of a Dummie's guide and a business leadership book.

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  1. Great overview, Doug.  It’s important to note, however, that
    avoiding and conquering email deliverability problems requires a comprehensive
    email hygiene, correction, and validation service as opposed to simply the “pinging”
    (i.e. SMTP checks) that most of the vendors on your list provide.  An SMTP check only provides information on
    whether an email address is deliverable at a point in time and the accuracy of
    these results still leaves much to be desired as many ISPs do whatever they can
    to discourage this practice. Moreover, bounces are not the scourge of email
    marketers as almost all companies fall well below the bounce thresholds allowed
    by the ISPs.
    The largest issues facing
    email marketers result from problematic email addresses (e.g. spam traps, honeypots,
    heavy spam complainers, malicious addresses, etc.) in their files as well as inadvertent
    hygiene errors as these deliverable addresses are the ones that Spamhaus and
    other spam-filtering organizations use to ferret out spammers and fast and
    loose marketers.
    To stay off the radar of the
    spam-filtering organizations and thereby optimize your deliverability and
    revenues, one needs to work with an email hygiene, correction, and validation
    provider that can:
    1)Block problematic
    addresses from getting into your database and clean out the ones that have
    already gotten there
    2)Correct typos and
    other hygiene errors as Spamhaus has turned many of the frequently made typoed
    addresses into spamtraps
    3)Validate the
    deliverability of each email address by checking against email-specific
    activity (e.g. opens, clicks, bounces, spam complaints, etc.), a historic
    archive of MX and SMTP checks, and real-time SMTP checks.
    Costs for the service above
    starts at a penny per email address and drops significantly with volume
    increases.  Furthermore, avoid any
    service provider whose service is not available in real-time, automated batch
    (i.e. 24x7x365), and full service batch mode, which includes manual
    If you’re looking to ensure
    your email marketing efforts achieve the best possible ROI with a minimum of
    costs, hassle, and risks, partnering with an email hygiene company will prove
    to be the best small investment you can ever make.
    For more details on how 25% of
    the Fortune 100 companies as well as thousands of marketers, big and small, are
    keeping their email databases fresh and up-to-date, see

  2. Hello Doug,

    Have you tried ? I tried a few services from your list and after being less than satisfied with either the results or price, I continued my search and found Bulk Email Checker. I honestly can say my search for a high quality low price email validation service is over. I have been using them for the past 4 months and could not be happier. Check them out and hopefully you can stop your search too!

    Thanks Doug, have a great weekend!

    1. I am currently in the process of looking for a company to verify my list and wanted to find out why you were dissatisfied with some of the other providers? I am new to this and it’s overwhelming going through the many websites to determine what makes them different. So if you could possibly share why you were dissatisfied with the others and why you are choosing Bulk Email Checker over all the other sites. This will help me and maybe many of the others who read this. I do see that the prices are much better on Bulk Email Checker but I would also like to know other things that maybe make them better. Thanks in advance for responding.

      1. Hi Simone, there are already risks associated with using older lists or purchasing lists. Email service providers, for the most part, despise any company importing email addresses that haven’t been vetted. And Internet Service Providers that accept the email will absolutely divert all of your email or even block your provider if a lot of those email addresses bounce or report the email as SPAM. As a result, utilizing a list verification tool is critical when rolling in email addresses of relevant email addresses. If you use the wrong tool, you risk yourself being blocked by the ISP and being kicked off of their email service provider.

  3. Hello,

    Thank you for the list!! I have a question. I want to start my own email cleaning service. Could you recommend any good software to buy. I have looked with no luck so far. I want it automated as possible. thank you

  4. Simple way to check the database mail address, The most advanced email checker.
    We are in beta test now but we have the most accurate way of testing.
    We need feedback. You can get provide some amount to test the service.

    1. I just went to your site to test out your services however – there is no phone number. It’s highly unlikely that anyone would just upload a list of subscribers to your site without touching base with an account manager or someone to validate that I am not just give my subscribers to an unknown source.

  5. Hey Douglas. I’m a bit surprised you didn’t mention Verifalia in your list. Not only it appears to be one of the greatest email validation providers in Europe but they also offer unique features I didn’t see anywhere else, including support for email addresses which do not use the Latin alphabet (we have many clients in our lists from Singapore, Japan and Saudi Arabia, for example), and ability to perform in-depth validations spanning multiple passes, to validate email addresses with temporary issues like mailbox over quota or greylisting. This provider also exposes a RESTful email validation API for software developers and libraries for major programming languages and platforms… And they even have a Free plan which comes with up to 125 free email validations per day.

  6. I used some of the recommendations in this blog to pick an email list verification service. I ended up going with, and while I was happy with them on my first list, every subsequent list I’ve tried to run on their service has been problematic, mostly in that I can’t download a list of the clean emails afterwards. What’s the point of using their service if I can’t find out which email addresses are valid? Aside from that, their support isn’t very responsive and they’re not preoccupied with retaining customers.

    1. Andrea, I believe so. I think the way to do it is to have your form work with the API of the verification company. Once the email is returned as verified, then you can push it to GetResponse.

  7. Hi Douglas,

    I am currently using to verify email addresses in a fortune 500 company’s email marketing application. I have no complaints as the quality of service is perfect, however we are looking for a lower cost alternative that offers the same quality. Can you suggest an alternate enterprise grade api that could be used? “Enterprise grade” being the keyword. Thank you for your help!

  8. Hi Ron,

    I hope, you are doing well, just to update you, We are running our Email verification process.
    where you don’t need to waste your much money. I will be more than happy to answer you about our process How we work actually.

    We are getting the list from the clients who wants to verifying emails, then we called the receptionist or the General Manager of the company then we collects their Valid emails,
    by doing this way after 15 days we check it with our email verification process we do Eblast .

    If any one have any confusion or question on this regarding costs.
    Feel free to mail us we will get back to you as soon as possible

  9. Thanks for the article! I have been using the and fairly pleased with it. Price wise it is less expensive that others and as far as quality and speed.

    1. is a scam company. The service doesn’t work. I have paid for 10000 checks, uploaded my list of 4000 emails and it’s been “Processing” for the last 2 days.. The Live Help on site and all the info about the site I could find online, through Google is always from a man called Roman (who is also probably a owner of the site) and his friend Anna. I have found no other credible reviews and shouldn’t have given them money as they are now completely silent. They mentioned something about “programmer working on the server right now” but since then – no communication and no money back. DO NOT USE!!!

  10. Thank you for the post!
    We are looking for a company who can give officially approved document about that the verified e-mail addresses are really valid and checked.
    Do you know any company like that?
    Thank you

    1. Hi Anna,

      I’m not sure anyone can provide an official verification since people discontinue use of emails and change email addresses every day. At best is a platform that tries to capture email address changes and your list can be scrubbed against that.


  11. “The irony, in my opinion, is that I believe it’s easier for a SPAMMER to get email into your inbox than the average company sending a valid message.”

    You’re probably right on this, but that’s because generally businesses don’t use email marketing correctly, or frequently enough for their lists to become more usable and for them to learn the best practices. They (everyone) should email more frequently.

    But about the list of tools… awesome!

  12. Hello,

    I am looking for information regarding verifying email addresses in real-time as a new customer comes to my company. Is that software/technology available for me to add into our current software? Or would we need to change over all of our current software? Pretty much we have a problem of our team typing in customer email addresses wrong or the customer doing so as well. I would like to stop it at the point of purchase instead of the list being cleaned then us just holding out a bad email address instead of reaching our customer.

    1. if your looking at real-time email verification, speak to the guys at, I have first hand experience in using their real-time solution and its great and accurate!

  13. Great article Doug very informative and some great comments, We run a lead gen company and have numerous squeeze pages across the web for clients and are collect a few thousand emails a day! we’ve used a few companies but ended up go back to our first company we tested with (a company called Email Checker) as found their software to be the most accurate and reliable. We use their API on our squeeze pages and its a great tool for us and very popular with our clients, they do offer bulk verification as well which we do use used form time to time but we use their API daily with great results. Anyway just wanted to share my experience as I know there is so much competition out there, give the guys at emailchecker a shout their website is and tell them John Morgan sent you 🙂

  14. Hello!
    Can I add one more great tool to this list?
    TrueMail ( is a great email verification tool.
    It’s very accurate and easy in use. It will quickly clean your list from invalid and dangerous email addresses.
    By the way, it has 1,000 free email verifications every month.

  15. Hi Doug, it is fantastic the way you have kept the article updated over the last few years with new service providers, I commend the effort. I would love to suggest Antideo to be added to the list, it is one of the most affordable services out there. The free tier that offers more than 5000 validation checks a month is more than enough for a small business, so would greatly appreciate if you can take a look at the service ( and include us in your list if you see fit.

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