Email verification API is an online service or tool that automatically checks an email’s validity and quality by verifying its existence and the presence of typos or errors.
Modern businesses and developers now have the option to integrate email verification APIs into their email marketing campaigns instead of relying on manual email verification, which is prone to errors and consumes significant time.
Advanced email verification APIs quickly check and remove invalid, incomplete, incorrect, and disposal emails, improving email deliverability and the sender’s reputation in the market. These APIs can be used for both single and bulk email verification.
Geekflare has researched and listed the best email verification APIs based on key features such as typo detection, bulk verification, disposable email detection, and more.
- Abstract API – Best for Scalability
- Hunter – Best for Prioritizing Deliverability
- Captain Verify – Verify Best for Both Email and HLR Validation
- WhoisXML API – Best for Comprehensive Domain and IP Information
- ZeroBounce – Best for Bulk Email Verification
- DeBounce – Best for Small to Medium Businesses
- Mailboxlayer – Best for Simple JSON-Based Email Validation
- Email Hippo – Best for Dealing with Email Fraud
- SendGrid – Best to Integrate with SendGrid Transaction
- Mailgun – Best for Control and Detailed Email Deliverability Data
- Emailable – Best for Rapid Email Validation
- Reacher – Best for Proactive Email Deliverability Monitoring
- NeverBounce Verify – Best for Robust Email Cleaning and List Segmentation
- Clearout – Best Combined Email Verification and Lead Generation Solution
- Kickbox – Best for Strict Email Deliverability Standards
- Verifalia – Best for Automating the Email Hygiene Process
- Show less
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Abstract API
Best for Scalability
Abstract API is an email validation service provider that removes unwanted emails and disposable email addresses from the list and enhances your email delivery rate. It offers MX, SMTP, typos, and disposal email services in real-time and can handle many requests per second.
Abstract API offers a reliable, redundant, and fast service with data privacy built for uptime and speed. It can be easily integrated into business tools for expanded functionality by financial institutions, public companies, airlines, etc.
Get an industry-leading quality score, smart learning, high-risk and low-reputation domain alerts, smart suggestions, toxic domain detection, catch-all email detection, free email detection, spam trap filters, and more. Abstract API also offers greylist monitoring, syntax validation, bulk operations, multiple API keys, role detection, and multiple text environments.
Abstract API provides secure and reliable email validation services, with features such as AML and SSO logins, technical support, compliance with SOC 2 and GDPR, dedicated account professionals, and high uptime. Additionally, it offers SDKs and documentation for quick and accurate email validation.
Abstract API Pros
Offers accurate results with its proprietary ML models like email AI assistants
Guarantees 99.99% uptime
Detailed documentation for developers
Abstract API Cons
Limited pricing options
Features like email tracking and reputation monitoring are missing
Abstract API Pricing
| Pricing Type | Pricing | Email Verifications |
|---|---|---|
| Subscription | $12/month | 150,000 requests/year |
Hunter
Best for Prioritizing Deliverability
Hunter provides an email verifier API that allows you to verify all the email addresses in your database with a single API call. It takes email addresses as input and provides information with additional data and confidence scores.
Hunter’s email verifier API offers nearly 100% uptime and fast response times. Its renowned verification algorithm prioritizes email address deliverability. You will get important features like catch-all domain detection, disposal domain detection, MX and SMTP checking, and more.
Hunter API automates the email verification process by integrating with contact management software, CRM, and ERP tools, allowing users to easily check and verify emails.
Hunter Pros
Updates your email database automatically with new emails
Provides free API keys
High accuracy in results
Hunter Cons
Expensive as compared to other providers with the same features
Focuses primarily on professional or business emails
Hunter Pricing
| Pricing Type | Pricing | Email Verifications |
|---|---|---|
| Subscription | $34/month | 1,000 |
Captain Verify
Verify Best for Both Email and HLR Validation
Captain Verify’s API enables you to check a single email, import an email list for verification, or validate newly added emails. It is the best solution for both email and HLR validation. Along with emails, it checks the availability of mobile phone numbers.
Using Captain Verify, you can reduce bounce rates, duplicate emails, incorrect email addresses, and spam traps by easily detecting badly spelled emails, honeypots, hard bounces, etc. You will get a fast, reliable, and secure email verification service to increase your email delivery rate.
For a successful email marketing campaign through emails and SMS, the Captain Verify API helps you target valid contacts and send them bulk emails and SMS simultaneously. It also securely verifies your phone contacts and business emails under GDPR compliance.
Captain Verify offers MTA verification, full mailbox detection, SMTP verification, domain checking detection, valid email address detection, MX detection, disposal emails, roles detection, standardized emails, anti-greylisting, etc.
Captain Verify Pros
Cheaper than many email verification API services
Verifies SMS and emails both
Supports single and bulk email verification
Captain Verify Cons
Takes a while to show the final result
It is limited to 50 checks per minute
Captain Verify Pricing
| Pricing Type | Pricing | Email Verifications | Free Plan |
|---|---|---|---|
| Subscription | $30/month | 5,000 | 100 credits |
| Pay-as-you-go | $7 | 1,000 | 100 credits |
WhoisXML API
Best for Comprehensive Domain and IP Information
WhoisXML API is an email verification API that verifies the quality, validity, and existence of email addresses in your email database. It also provides comprehensive domain and IP information in real-time.
With WhoisXML API, you can perform email verification and validation, reduce email bouncing, detect errors in spelling, block spam emails, and more. It checks if the email address is branded and disposable, its syntax, the existence of the mail server, and catch-all email addresses to improve email campaign quality and sender score.
Segment the emails based on domains, free emails, badly spelled emails, grammar checks, etc., to get accurate emails in your file. You can utilize the WhoisXML API tool library to integrate with your business tools and automate your email verification task.
WhoisXML API Pros
Delivers results in XML and JSON format
Ensures security by connecting with netblocks, DNS databases, and IP geolocation to scan harmful domains and IP addresses.
WhoisXML API Cons
Expensive for small businesses.
Sometimes, they provide less information
WhoisXML API Pricing
| Pricing Type | Pricing | Email Verifications | Free Plan |
|---|---|---|---|
| Subscription | $54/month | 10,000 | 100 queries |
ZeroBounce
Best for Bulk Email Verification
ZeroBounce’s email verification API helps clean email lists by identifying high-risk, invalid, bouncy, and spam emails in real-time with 99% accuracy. It can verify emails in bulk and integrate with business tools for real-time results.
ZeroBounce quickly detects and verifies newly added emails, checking for typos, domain validity, syntax errors, and more. It offers data privacy and security with military-grade encryption.
Get single email validation, batch/bulk verification, custom blocklists and allowlists, bulk file management, tracking API usage, retrieving credit balances, and more. ZeroBounce also checks for disposal and abuse emails.
ZeroBounce Pros
Guarantees 99% accuracy
Focuses on securing data
Faster, validating a single email within 3 seconds
ZeroBounce Cons
The anti-greylisting feature is missing
No team account
ZeroBounce Pricing
| Pricing Type | Pricing | Email Verifications | Free Plan |
|---|---|---|---|
| Subscription | $18/month | 2,000 | 100 credits/month |
| Pay-as-you-go | $20 | 2,000 | 100 credits/month |
DeBounce
Best for Small to Medium Businesses
DeBounce API verifies the email addresses you have and provides you with a clean list to help you run your marketing campaign effectively. It offers a team account where you can add your team members to upload and clean all the emails, making it the best API tool for small to medium businesses.
Debounce cleans your email lists by identifying spammy, bouncy, non-operational, and invalid emails. It minimizes bounces, checks disposal emails, eliminates the wrong syntax, removes duplicate emails, provides selectable downloadable options, and removes spam traps.
The anti-greylisting technology helps you minimize the number of unknown emails so that you can send bulk emails with greater deliverability. DeBounce removes invalid and parked domains, checks catch-all domains, and validates MTA to check whether the emails have a valid MX record. Connect your existing email service provider (ESP) account with it to keep your email lists clean.
DeBounce Pros
Offers real-time email validation
Allows you to upload TXT or CSV file
The pricing is good for small-to-medium businesses
DeBounce Cons
The segmentation feature could have been better
The response time of the support team could be improved
DeBounce Pricing
| Pricing Type | Pricing | Email Verifications | Free Plan |
|---|---|---|---|
| Pay-as-you-go | $10 | 5,000 | 100 credits |
Mailboxlayer
Best for Simple JSON-Based Email Validation
Mailboxlayer is an email verification and validation JSON API that measures email quality and deliverability, making it one of the best options for JSON-based email validation. Developers can easily integrate it with your business tools to get detailed information on all the emails, including valid/invalid, SMTP, role, disposal, free, etc.
Mailboxlayer provides real-time verification of email addresses to ensure a clean and high-value email database, reducing bounce rates. It provides secure 256-bit HTTPS encryption and advanced verification tools for email addresses, including SMTP verifier, typo checker, email filters, deliverability score, and quality score.
Mailboxlayer Pros
Easy to use for developers, especially with JSON expertise
High result accuracy and a low bounce rate
Offers 100 free email verification every month
Mailboxlayer Cons
The catch-all detection feature is missing
Sometimes, results are not accurate
Mailboxlayer Pricing
| Pricing Type | Pricing | Email Verifications | Free Plan |
|---|---|---|---|
| Subscription | $14.99/month | 5,000 | 100 API requests/month |
Email Hippo
Best for Dealing with Email Fraud
Email Hippo provides an email verification API that automatically detects spam and fake email addresses. It also detects blocklisted emails and identifies domains that charge fees to receive emails, making it perfect for dealing with email fraud and detecting phishing emails. The API also highlights dark web users’ emails and gives you a genuine and clean list.
Email Hippo API offers 99.99% uptime, simple integration options, quick response times, advanced security, high performance, and other benefits. You will get a disposal email detector, role checker, freemail checker, catch-all mail checker, mail server location, syntax checker, dashboard, and more.
With the higher version of Email Hippo, you will find greylist detection, MX record checking, spam email detection, safe-to-send score, trust score, mail system detection, and blocklist detection. You can use it in marketing platforms, CRMs, sign-up forms, etc., to verify emails accurately.
Email Hippo Pros
Faster response time
Easy-to-understand dashboard for monitoring and analysis
Provides essential statistics to understand email list health
Email Hippo Cons
The dashboard doesn’t show granular reporting
Sometimes, it takes longer than expected to finish checking the lists
Email Hippo Pricing
| Pricing Type | Pricing | Email Verifications | Free Plan |
|---|---|---|---|
| Subscription | $9.88/month | 1,000 | Free trial |
SendGrid
Best to Integrate with SendGrid Transaction or Email Marketing
SendGrid provides an email validation API that enhances email deliverability rates and increases your marketing ROI. It integrates quickly with SendGrid transaction or email marketing solutions to let you run effective marketing campaigns.
SendGrid uses ML-based methods and mailbox provider-friendly to identify inactive, non-existent, mistyped, shared, or disposal emails. The real-time API identifies and removes invalid emails from the list, reducing the bounce rate and ensuring messages are delivered to genuine contacts, which improves your email marketing efforts.
You can connect SendGrid’s real-time email verification API with your online forms to catch bot or false entries instantly. It also prompts the users to correct the field and resubmit the form with valid details.
With SendGrid API, you will stay as a reputed sender by maintaining mailbox provider trust. Your visitors’ information will be safe and secure under GDPR compliance.
SendGrid Pros
Setup is easy with its thorough API documentation
Imports emails directly from your database and cleans them automatically
Offers best reporting functionality
SendGrid Cons
No access to email validation in the basic plan
Customer service could have been more responsive
SendGrid Pricing
| Pricing Type | Pricing | Email Verifications | Free Plan |
|---|---|---|---|
| Subscription | $19.95/month | 50,000 | 100 emails/day |
Mailgun
Best for Control and Detailed Email Deliverability Data
Mailgun’s email validation tool catches bad emails in real-time and improves your email deliverability. Its optimized suite of email deliverability tools provides greater control and detailed email deliverability data.
Mailgun API bulk email verifier uses the grammar rules of different inbox service providers to increase email validity and improve the sender score.
By integrating the Mailgun API with your web forms, you can easily catch errors and invalid addresses before they cause problems. The API automatically verifies and cleans all the emails in the list so that you are always ready to send your promotional emails.
Mailgun API reduces bounce rates by removing spelling mistakes, removing disposal emails, and removing temporary email addresses. It also offers mailbox verification, an email checker, role-based address checks, a reporting dashboard, and rate limiting for API keys.
Mailgun Pros
Clear, quickly understandable metrics
Easy-to-follow documentation and guides
Easy to integrate with multiple programming languages
Mailgun Cons
Service interruptions sometimes
Occasional deliverability and downtime issues
Mailgun Pricing
| Pricing Type | Pricing | Email Verifications | Free Plan |
|---|---|---|---|
| Subscription | $49/month | 2,500 | First month free in every plan |
Emailable
Best for Rapid Email Validation
Emailable’s email verification API is an easy-to-use solution that offers rapid email validation by filtering invalid email addresses automatically from your landing pages, applications, or website when integrated.
Emailable allows you to check your API usage by tracking the verifications you already performed. With Emailable’s custom charts and statistics, you can gain clear insights into the responses. It also provides sample code, batch operations, test environments, client libraries in several languages, and webhooks.
Emailable API follows industry-standard security and privacy guidelines, including Privacy Shield and GDPR. It stores all data for 30 days, after which it is auto-deleted.
Emailable Pros
Provides HTTP API, which is easy to use and integrate
Offers 250 free credits
High accuracy while presenting results
Emailable Cons
Offers fewer integration options
Support team takes time to resolve issues
Emailable Pricing
| Pricing Type | Pricing | Email Verifications | Free Plan |
|---|---|---|---|
| Subscription | $32.30/month | 5,000 | Free trial |
| Pay-as-you-go | $38 | 5,000 | Free trial |
Reacher
Best for Proactive Email Deliverability Monitoring
Reacher is an open-source, real-time, and white-label email verification API that provides a world-class email verification service for your business. This API is best for proactive email deliverability monitoring as it quickly connects to the mail server and checks an email’s validity in real-time.
Reacher is a scalable API that easily fits with horizontal scaling technologies. It cleanses large email lists and prevents spam sign-ups, reducing your bounce rate. You will get MX records, MTA validation, an SMTP checker, catch-all domains, a role-based accounts identifier, a disposal emails verifier, syntax errors, etc.
You can integrate your applications with Reacher’s powerful API to enhance your email deliverability. It is built with the robust and fast Rust programming language and the Warp web framework. It offers quick and efficient real-time email verification by uploading lists and receiving a clean list in CSV format.
Reacher Pros
The commercial license allows self-hosting the service
Offers 30-day money-back guarantee
Incredibly faster, it takes approx. 1.9 seconds to run an email verification in real-time
Reacher Cons
Expensive for small businesses
No call support
Reacher Pricing
| Pricing Type | Pricing | Email Verifications | Free Plan |
|---|---|---|---|
| Subscription | $69/month | 10,000 | No |
NeverBounce Verify
Best for Robust Email Cleaning and List Segmentation
NeverBounce’s Verify API verifies your visitor’s emails at the entry stage so that you will always have a clean list of emails without spam. You can easily add the API to your registration forms, lead pages, and other pages where you collect emails. It segments the list based on different parameters and provides a robust email cleaning service.
NeverBounce Verify API removes incorrect and fake email addresses, allowing you to reach your target audience. It provides verification history, results, and tracking in a dashboard.
NeverBounce Verify allows you to monitor your API usage and get a complete stat on responses. You can integrate the API with your business apps using JavaScript code snippets or integrate from scratch using other programming languages.
NeverBounce Verify Pros
Reduces the risk of email fraud
Provides a streamlined, efficient email verification method
Offers a faster email verification service
NeverBounce Verify Cons
Sometimes fails to handle a large volume of emails and slows down the verification process.
Integration can be complex
NeverBounce Verify Pricing
| Pricing Type | Pricing | Email Verifications | Free Plan |
|---|---|---|---|
| Subscription | $8/month | 1,000 | Free trial |
| Pay-as-you-go | $8 | 1,000 | Free trial |
Clearout
Best Combined Email Verification and Lead Generation Solution
Clearout offers a simple REST API to quickly verify and validate bulk emails and enhance the sender’s reputation. It combines email verification and lead generation solutions to reach the right audience at the right time and improve email performance.
You will get greylisting verification, catch-all verification, syntax validation, block verification, AOL and Yahoo validation, gibberish check, autosuggestion, duplicate email removal, etc. Clearout provides industry-leading checks for domains, MX records, mail quotas, mailbox errors, role accounts, free accounts, and more.
With Clearout’s email verification API, you can eliminate bounces, reduce complaints, boost deliverability, and protect against email fraud. You can easily integrate it with your favorite applications to validate emails in real-time.
Clearout Pros
Provides email finder and prospect finder options
Takes data security strictly, reducing spam complaints
Normalizes sub-addresses to avoid emails pointing to the same inbox.
Clearout Cons
Takes a longer time when verifying emails in bulk
Offers fewer integration options
Clearout Pricing
| Pricing Type | Pricing | Email Verifications | Free Plan |
|---|---|---|---|
| Subscription | $14/month | 3,000 | Free 100 credits |
| Pay-as-you-go | $35 | 5,000 | Free 100 credits |
Kickbox
Best for Strict Email Deliverability Standards
Kickbox’s email verification API prevents misspelled or mistyped signups while filling out the signup form. It follows a strict email deliverability standard with its point-of-capture API.
With Kickbox’s API, you no longer have to worry about manually managing disposal emails, free emails, and free trial accounts. This API enables you to remove fake details and form submissions in real-time, helping you maintain a positive brand reputation and reducing your bounce rates.
Kickbox allows you to verify your emails in bulk without uploading them manually. This will help you find unknown, spammy, bouncy, misspelled, undeliverable, and risky emails. You will get a guarantee of 95% accuracy, resulting in clean and quality emails in your database. You can also track your response rates by accessing the API dashboard.
Kickbox Pros
Provides comprehensive data compliance with bodies like GDPR, CCPA, CASL, etc.
Stores your list data for 90 days before it gets auto-deleted
Provides Sendex Score to get more insights on address quality
Kickbox Cons
Doesn’t provide full context on risky contacts
Email verification history is absent
Kickbox Pricing
| Pricing Type | Pricing | Email Verifications | Free Plan |
|---|---|---|---|
| Pay-as-you-go | $5 | 500 | Free 100 email validations |
Verifalia
Best for Automating the Email Hygiene Process
Verifalia API is an easy-to-use and powerful API service that automatically maintains your email hygiene and ensures the authenticity of your existing database and new email addresses.
Verifalia is built on an HTTPS-based RESTful API that exports data in JSON format, making it easier for anyone to understand. It provides open-source SDKs that you can leverage to integrate its API into business applications. It also helps you maintain healthy customer relationships by ensuring the emails are delivered directly to their inbox.
Verifalia Pros
Offers open-source and free SDKs
Improves mailing campaign by maintaining email hygiene
Provides enough free credits on a daily basis
Verifalia Cons
Lacks features like spam-trap, anti-greylisting, character and gender identification, etc.
No option for call support
Verifalia Pricing
| Pricing Type | Pricing | Email Verifications | Free Plan |
|---|---|---|---|
| Subscription | $7.9/month | 100/day | 25 daily free credits |
Email Verification APIs Comparison
| Email Verification APIs | Disposal Email Detection | Typo Detection | Starting Price USD (monthly) |
|---|---|---|---|
| Abstract API | Yes | Yes | $8 |
| Hunter | Limited | No | $34 |
| Captain Verify | Yes | No | $27 |
| WhoisXML | Yes | No | $54 |
| ZeroBounce | Yes | Yes | $18 |
| DeBounce | Yes | Yes | $10 |
| Mailboxlayer | Limited | No | $13.50 |
| Email Hippo | Yes | No | $9.49 |
| SendGrid | No | Yes | $19.95 |
| Mailgun | Yes | Yes | $49 |
| Emailable | Yes | Limited | $32.30 |
| Reacher | Limited | No | $69 |
| NeverBounce | Yes | No | $8 |
| Clearout | Yes | Yes | $23.2 |
| Kickbox | Yes | Yes | $5 |
| Verifalia | Yes | Yes | $9 |
Benefits of Email Verification API
The benefits of email verification API for businesses and developers are:
High Accuracy
Email verification APIs use advanced algorithms to verify and remove invalid email addresses from your list, ensuring that your email campaigns are effective and free from spam and fraud.
Easy to Integrate
Developers can easily integrate email verification APIs with your sales and marketing tools, such as CRM, analytics software, SEO tools, and more. This will help you automate tasks and get more work done in fewer steps without constantly changing tabs.
Improved Deliverability
Checking your email lists with email verifier API servers quality, genuine emails to which you can send your marketing emails. This means your message will reach your target audience more, reducing the number of delivery failures or bounce rates.
Upholding Sender Reputation
Sender’s reputation is vital for businesses. Too many spam complaints and email bounces risk your authority in the market and may cause penalties. Clearing your email list with an email verifier and API and then running your campaign helps enhance the sender’s reputation by improving delivery rates.
Better Campaign Performance
With a clean email list in your database and a powerful message to send, the probability of campaign success increases. This means your efforts and investments won’t go in vain; instead, you can register higher ROI from your email campaigns.
Frequently Asked Questions
Yes, you can clean out your emails using an email verification application like Captain Verify, Clearout, ZeroBounce, etc.
Yes, there are different ways to verify an email. First, you can use an email verification application to check for typos, syntax errors, validity, etc. Another way is to integrate an email verification API with your business tools and check for mistakes and validity.
Yes, you can verify emails in bulk by uploading CSV or TXT files directly to your email verification API or application and getting the final result accurately.