We manually looked through thousands of Email apis to find the best. Here is a list of the most popular and cheapest Email APIs.

API to manage audiences, integrate your data, and send timely, relevant email campaigns.

Here is a list of features of Mailchimp Marketing API:

- Leverage the Marketing API to integrate your users’ data with Mailchimp’s marketing scale.

- **Create an audience and add contacts**
Integrate your application with the Marketing API to create and add contacts to a new audience.

- **Organize your contacts with tags**
Use tags to bring your application’s email targeting and organization strategy into Mailchimp.

- Sync events in your app with Mailchimp to create powerful email automations at scale.

- **Track events that trigger automations**
Monitor and act on your users’ behavior outside emails with the Events endpoint.

- **Run requests asynchronously with the batch endpoint**
Scale large or long-running calls to the Marketing API with batch requests.

- Use the Marketing API to keep your data in sync with Mailchimp.

- **Synchronize audience data with webhooks**
Keep your data store in sync with your Mailchimp audience via webhooks.

- **Access data on behalf of other users with OAuth 2**
Integrate your product with your users’ Mailchimp accounts by authenticating via OAuth.

Mailchimp Marketing API

The Gmail API is used to interact with users' Gmail inboxes and settings, and supports several popular programming languages,

Here are some of the key features of Google API: 

- Read and send messages. 
- Manage drafts and attachments. 
- Set up push notifications and manage settings.

Gmail API

Simple REST API measuring email deliverability & quality

**Email Validation & Verification JSON API for Developers**
_Simple REST API measuring email deliverability & quality_

**mailboxlayer API**
Mailboxlayer offers a simple REST-based JSON API enabling you to thoroughly check and verify email addresses right at the point of entry into your system.

In addition to checking the syntax, the actual existence of an email address using MX-Records and the Simple Mail Transfer Protocol (SMTP), and detecting whether or not the requested mailbox is configured to catch all incoming mail traffic, the mailboxlayer API is linked to a number of regularly updated databases containing all available email providers, which simplifies the separation of disposable (e.g. "mailinator") and free email addresses (e.g. "gmail", "yahoo") from individual domains.

Combined with typo checks, did-you-mean suggestions and a numeric score reflecting the quality of each email address, these structures will make it simple to automatically filter "real" customers from abusers and increase response and success rates of your email campaigns.

Here are some of the key **features** of Mailboxlayer API:

- **Full Verification**
Verify email addresses as they come into your system and make sure you only send email to real customers and high-value contacts »

- **Simple & Secure API**
Requested using an easy-to-integrate URL structure, delivered in lightweight JSON format, and secured via 256-bit HTTPS encryption »

- **Advanced Tools**
Syntax & typo check, MX-Records & SMTP verification, Catch-all detection, free & disposable email filtering and deliverability score »

- **Easy on your Budget**
Everybody should be verifying email addresses - that's why we offer 250 monthly requests for free. Need more? Subscriptions start at $9.99 monthly »



Mailboxlayer API

Integrate in minutes with our email API and trust your emails reach the inbox

 **Email API—Build your ideal experience**
_Create an exceptional email program with the Email API trusted by top brands to deliver at scale._

- **Say goodbye to email fire drills**
Build and monitor your email solution on a trusted foundation—with technical and strategic support when you need it most

Email API features include a proven infrastructure, mta, and intuitive UI for analysis
-- **Proven email deliverability**
You can rely on our globally distributed, cloud-based architecture.
-- **Purpose-built MTA**
Use the MTA trusted to deliver over 100 billion emails/mo for brands like Uber.
-- **Time-saving features**
Fast troubleshooting, secure account management, and intuitive UI for data analysis.

- **Lost emails are lost customers**
_Getting your emails delivered is our #1 priority._
Emails are delivered to your customers at the right time
Achieve optimal inbox placement with streamlined tools and recommendations to make your program more effective.

-- SPF records, custom DKIM, feedback loops, and dedicated IP addresses
-- Consultation from delivery experts on M3AAWG, ESPC, DMA, and EEC
-- Partnerships with mailbox providers like Gmail, Microsoft and Verizon Media
-- Infrastructure includes automated queue handling and throttle threat detection


Email API

The Single Email Validation API does validation on a single email address to help you eliminate invalid and unreachable email addresses. 

The Single Email Validation API does validation on a single email address to help you eliminate invalid and unreachable email addresses. It checks for email syntax, MX record, MX server connection, email greylisting, free email, disposable email, suppressed email, role email, high risk email, catch-all email and so on. See immediate results for your email validation. Results returned in either JSON or XML formats.

**MAILBOXVALIDATOR EMAIL VALIDATION API**

MailboxValidator provides 3 very easy to use RESTful Web Services to verify accurately if an email address is valid. Our goal is to provide a very handy tool that helps customers to maintain a good email list and always deal with valid email addresses (real subscribers) at all times. Integrate real-time email verification into your app with our API is easy. You can integrate it into any web forms, CRM, POS or other points of data entry.

**Key features -  Single Email Validation API**

- Checks email syntax Email Syntax Checker
Validates that the email address conforms to a standard format.

- Checks MX record MX Record Checker
Checks for the existence of mail server records in the DNS.

- Tests network connection MX Server Connection Checker
Tests for a successful network connection to the mail server.



 Single Email Validation API

The Disposable Email API helps users to detect and block disposable emails from sign up.

**Disposable Email API**
MailboxValidator helps businesses to achieve better ROI on their email marketing campaigns by making sure that only valid emails are part of the campaign. This Disposable Email API checks if a single email address is from a disposable email provider and returns the results in either JSON or XML format. Disposable email addresses (DEAs) are temporary email addresses that are only valid for a very short period of time. DEA provider websites offer a service where users can generate a temporary email address that can be canceled very soon without affecting any of their normal email addresses. The most common situations of this type involve online registration for sign-in forms to take advantage of special offers, discussion groups or forums, bulletin boards, chat rooms, online shopping, and file hosting services. That is why we need email validation services to filter out those unwanted sign-ups.

The Disposable Email API helps users to detect and block disposable emails from sign up. It checks if an email address is from a disposable email provider and returns the results in either JSON or XML format. Disposable email addresses (DEAs) are temporary email addresses that are only valid for a very short period of time. 

- Email Greylisting Checker
Checks if the mail server uses spam trap as honeypot.

- Detects Free Emails Free Email Provider Checker
Checks to see if the email address is from a free email provider like Gmail.

- Detects Disposable Emails Disposable Email Provider Checker
Checks to see if the email address is from a disposable email provider like Mailinator.

Disposable Email API

Use the power of Hunter anywhere through simple API calls. Get started in minutes.

#### Build with Hunter
We believe the most efficient way to distribute a service is to start with an API. The main requests on Hunter can be made using simple API calls integrated wherever you need. Join thousands of growing businesses that have already integrated Hunter’s API to find and verify professional email addresses.

#### Main Functionalities
You can enjoy our service's features with our simple JSON API. Four main calls are available:
- The Domain Search returns all the email addresses found using one given domain name, with sources.
- The Email Finder finds the most likely email address from a domain name, a first name and a last name.
- The Author Finder guesses the most likely email of a person from an article he wrote.
- The Email Verifier checks the deliverability of a given email address, verifies if it has been found in our database, and returns their sources.

#### Resources
Our API also provides you a RESTful way to manage your Hunter's resources. These are the resources you can Create, Read, Update and Delete with our API:
- The Leads
- The Custom Attributes
- The Leads Lists
- The Campaigns

Hunter API

Capture valid email addresses with our real-time email verification API.

Kickbox’s realtime email verification API ensures you only collect real, valid email addresses so you never miss another opportunity to connect with a customer. Our API can be easily integrated everywhere you collect an email address.

#### What do you get with real-time email validation?
Real-time email validation has numerous benefits and can prevent lots of issues with bot accounts:

- Prevent fake or invalid email addresses from creating bogus accounts.
- Help your good customers fix email address typos before it’s too late.
- Protect your sending reputation and improve deliverability rates by eliminating bounces.

#### An easy, powerful email verification API for developers
Integrating Kickbox’s Email Verification API into your email data collection processes is one of the simpler things you’ll do. The API is lightweight, fast, and there’s no additional cost to use it! We arm you with the tools and resources you need to hit the ground running.

- Libraries for Node.js, Python, Ruby, PHP, and more.
- A batch API for different use cases.
- Free support from our developers in our dev Slack channel.
- Simple, Pay as You Go pricing.
- You can integrate our API with just a few lines of code and in just a few minutes.

KickBox API

Detects disposable, fake and throwaway email addresses in lightning speed.

### The Problem with Fake Emails
A disposable or a fake email looks like a real email address. Unfortunately, it is a throwaway address that is used once or twice and never again. So there will be no one reading all the marketing emails you send to that address.

As a serious business, you need to make sure that none of your users have are using a disposable email address to make sure you can reach them. Because there’s no one at the other end, you don’t get any engagement with such addresses.

#### But we can help!

This API is a quick, lightning speed way of detecting if an email address is disposable/throwaway or not. It is updated on a daily basis and features the most up to date database that is available. So instead of building your own service and trying to be up-to-date, just give a try to ours. It is free to try!

#### Key Features
- Updated daily.
- Fast and Efficient.
- Using the API is as easy as hitting a URL.


Disposable Email Detection API

Validates and verifies an email address assessing deliverability and quality.

#### Why use our API?
There’s plenty of significant reasons behind having proper validation in place:
- Sending emails to fake/no-longer-existent addresses will hurt your deliverability.
- Mistyping an email address will block users from confirming their account or resetting a password.
- Valid e-mail addresses, lets you stay in touch with users.
#### How it works
This API is the one and the only solid solution to verify that the e-mail address is valid, and reachable. We achieve this functionality by validation with regex, validating the DNS for MX records and than connecting the recipient's SMTP server for validation, without sending any email.

Yes! this email verification API actually connects to the mail server and checks in real-time if the email exists. We don't use historical data.This is the most robust and solid way that is possible within the SMTP protocol's limitations.

#### Features
- Syntax & Typo Check
- Free & Disposable Provider Databases
- Quality Score Feature
- Real-time SMTP MX-Records Check
- Catch-all Detection

 Email Verification API

Clean your email list and reach your customers

Bounces, spam complaints, spam traps and bots – they all wreak havoc on your email marketing. Let our email validator remove them from your list, so you can reconnect with your subscribers and boost your click rates.

#### Verify emails in real time, every time.
Connect our API to verify customer emails directly at the point of entry. Easily add the ZeroBounce email verifier to your lead pages, registration forms or wherever you collect emails.

#### Features
**98%+ Accuracy Guaranteed**
Email verification makes a difference only when it’s accurate, and our system guarantees you 98% accurate results. Take us for a test drive and see for yourself.

**24/7 Customer Service**
That’s right: our team is here for you 24/7 to answer any questions and guide you through the email verification process. Get in touch via chat, phone or email.

**High-speed email validation**
We move fast: it takes about 45 minutes to scrub an email list of 100,000 contacts with ZeroBounce. What’s more, our API validates an email address in under 3 seconds.

**Secure Email Validation**
Your data is safe while our system verifies it. We use military-grade data encryption and one of the best content delivery networks in the world.

Email Validation API

The smartest email scoring system for your list

Have you ever wanted to get in-depth insight into your email list? We developed ZeroBounce Score™ to offer you just that: the ability to look at your database and see exactly how active and valuable it is.

#### How ZeroBounce Score™ Works
ZeroBounce Score™ uses artificial intelligence to assess how your subscribers may interact with your emails. By detecting email activity levels, it reveals how likely you are to reach a real person on the other end of an email. The scores it returns range from 0 to 10, with 10 being the highest quality rating.

#### A Game-Changer in Catch-all Email Validation
When you run your list through ZeroBounce Validate™, a percentage of your results end up being catch-all emails. Some of our competitors simply mark them as “risky,” leaving you wondering what to do next. Should you keep emailing them and risk getting bounces? Or perhaps it’s best to remove them? But some lists get a 40% catch-all result, so you’d lose almost half of your leads!

#### We’re serious about security and your privacy
Your data’s security is everything to us. From day one, our entire team wanted not only the best email validator but also, military-grade security. Customers tell us it gives them great peace of mind knowing that, while they scrub their lists, their data is safe.

AI Scoring API

Our Activity Data feature allows you to gather insights into your subscribers’ overall email engagement.

#### Target your most active email subscribers
Boost your metrics and sales by discovering active subscribers and target them with your newsletters and campaigns. Once you’ve used our email verifier, add this extra data to your list to get more out of your email marketing and sales.

#### How Activity Data Works
Whether people open, click, forward or unsubscribe, this is the audience you have a real chance to reach with your emails. How do you know who they are? ZeroBounce Activity Data can help.

We built this feature to give you more insights into your lists and show you which of your subscribers have engaged with an email by either opening, clicking, forwarding, or unsubscribing.

#### Get Activity Data on Your List in 3 Simple Steps
**1.** Validate your email list.
**2.** Tick that box.
**3.** Discover your results.

#### Want your results in real time? Use the Activity Data API.
Activity Data also has an API endpoint, so you can uncover this data in real time. For best results, pair it with our email validation API and enrich your list as you go.

Activity Data API

DeBounce's enterprise grade cloud-based email verification solution is compatible with all programming languages.

### DeBounce's API for Email Validation
#### The most comprehensive API for real-time and bulk validation
Whether you're a developer who is writing an application that requires the registration of new valid users or just a business with a large mailing list, DeBounce can handle the task of verifying the validity of your emails.

**Simple Integration**
Email is the main means of contact between your business and the customer or client. DeBounce can help you reach your audience and keep your email sender reputation intact.
**Salable Validation API**
We provide full end-to-end services to suit all of your email address validation needs.

#### Which Checks Does Email Validator Perform?
DeBounce uses a multi-layer checking process, with every single email going through the following testing and cleaning steps:
- DNS validation, including MX record lookup.
- Disposable email address detection.
- Misspelled domain detection to prevent Typosquatting.
- Syntax verification (IETF/RFC standard conformance).

Extend Norbert’s email superpowers with flexible APIs

Build more and better business relations at scale, when and where you need it.

#### Automatically find email addresses for name + company

Use our prospecting API to integrate Norbert’s real-time email finding superpowers to any part of your software and business processes.

#### Key Features
- Up to 98% success rate
- Enrich with powerful data
- Works with Node.js, PHP, Python, and Ruby.


Prospecting API

### Extend Norbert’s email superpowers with flexible APIs

Build more and better business relations at scale, when and where you need it.

#### Automatically verify email addresses for deliverability
Use our verification API to integrate Norbert’s real-time email verification superpowers to any part of your software and business processes.

#### Key Features
- Up to 98% email deliverability
- Works with Node.js, PHP, Python, and Ruby.

Verify API

### Extend Norbert’s email superpowers with the Enrich API

Build more and better business relations at scale, when and where you need it.

#### Automatically enrich contacts with contextual data that builds

Use our enrichment API to integrate Norbert’s real-time enrichment superpowers to any part of your software and business processes.

#### Used for:
- Companies
- Locations
- Job Roles
- Social Media Profiles

#### Automate your workflow for all developers
Works with Node.js, PHP, Python, and Ruby.

Enrich API

### Email Verification API
Keep your email list all clean. Notify website user about an invalid email address when they are filling out a form.

#### Copy & Paste
Just copy a few lines of code to your website and you are ready to go!

#### Real-time email input validation
User registrations, newsletters, online polls or any other forms on your website – these are the places where you can catch bad emails before they get to your database. Keep your email list clean with no additional effort.

#### Working examples and libraries for you
We have prepared complete libraries for the most popular languages.
Implementation to your website will be a piece of cake.

#### Healthy email list with no additional effort
Get rid of spam traps, hard bounces, disposable or catch-all emails. Clean your email lists now!



Email Verification API

Powerful Email Finder to locate accurate B2B prospects on any domain.

### Discover Your Ideal Prospects Instantly
Expand your reach. Engage with the prospects. Drive sustainable growth.

#### What Makes Clearout Email Finder Unique ?
**Get Results From Any Data**
We offer assured results in every scenario. Get optimum results from scraped / lowest quality too.
**Results Backed With Confidence**
Get the confidence score with each lead to strengthen your cold marketing strategies.
**Diverse Ways For Lead Discovery**
Remove lead generation ordeals with multiple ways of lead discovery. This includes quick email finder, bulk email finder and integrations.
**Anticipate Campaign Results**
Understand and predict the results of your campaign with the 'Confidence Level' for your target audience list.

#### API Integration For Developers
Clearout Email Finder is available through simple REST API for instant and bulk email finding that can be seamlessly integrated with all programming languages.

Email Finder API

Bring excellence in verifying ideal prospects.

### Do it all with Clearout
#### Point of Capture Email Verification
Protect your database from fake, disposable, & bad email with Clearout's real-time email validation API. Effectively capture high quality leads at the point of entry in any of the landing page or forms or wherever email is captured :
- Websites and Newsletters.
- Chatbots.
- Surveys/Polls.
#### Bulk Email List Verification
Poor data quality leads to poor visibility and analysis. To clean up your email database and increase email deliverability, use bulk list upload or integration options
- Reduce spam complaints by not emailing to risky email accounts
- Safeguard your sender reputation & avoid getting penalized
- Boost your ROI with a reliable database and high-quality, accurate leads.

#### Find Emails of Your Prospects
Clearout takes care of finding verified emails of your leads so that you can focus on converting them. With Clearout’s bulk email finder, you can generate more leads in one go, making your sales staff's job easier and more efficient.

 

Automatically Remove Invalid Email Addresses Before They Become a Problem

#### *mailfloss* removes fake emails before they become a problem
When you connect mailfloss to your favourite email service provider, we scan for invalid email addresses and remove them every single day, increasing your email deliverability and getting more of your emails into the priority inbox.

#### Fake emails in your list hurt your business
When you send emails to fake email addresses you get penalized. That means more of your emails end up in spam and less in the inbox of your real customers.

#### We even fix typos of popular email services automatically
Email services like Gmail, Hotmail, Yahoo, and AOL frequently get misspelled. mailfloss fixes these email address typos and syncs them with your email service provider automatically. You don't have to lift a finger.

**Setup in 60 seconds**
All it takes is a few button clicks and you only have to do it once. No developers needed and no more cumbersome spreadsheets.

**Works with your favourite email service providers**
We support 35 of the most popular email service providers and we keep adding more.

**Automatically delete, unsubscribe, or update tags and custom fields**
You have powerful options at your fingertips. And you're in complete control of what you want mailfloss to do.





Mailfloss

Integrate our Email Verification API in your website or application.

### The API of choice for mission critical applications
Filter invalid email addresses directly on your website, landing pages, or in your application.

#### Built by Developers for Developers
Quickly build production-ready integrations with modern tools and simple documentation. Our email verification API is easy to use and quick to set up.

- Sample code
- Test environment
- Batch operations
- Webhooks
- Client libraries in multiple languages

#### Code in the language of your choice
Start using email verification in your project with our simple HTTP API. Or, use one of our client libraries to make it even easier.

#### Visualize your usage
Get a high level view of your API usage. See how many verifications you perform over time with our custom charts, and gain insights into your responses with result statistics.

#### Built to scale
Our API is engineered with scalability and reliability in mind. Businesses of every size, from startups to public companies, use our API to power their email verification.

emailable API

Email verification and deliverability testing tool.

### Take control of your email deliverability
Increase open rates and ROI with quick, reliable insights that help you make strategic decisions about your domains, IPs, email list and campaigns.
- Guaranteed 98%+ delivery rate with your verified email list.
- Tools to test and optimize email content and inbox placement.
- 12+ years of email deliverability expertise and success.

#### Validate your email list in seconds
Verify a single email address, upload your entire email list, or validate new emails in real-time with the API. Get automated recommendations about list maintenance so you can clean up invalid emails for maximized deliverability.

#### Analyze and improve email content
Protect your sender reputation and boost deliverability by testing email content before you hit send. Email Insights flags spam words, broken links, blocklists and more so your emails avoid spam folders and reach the inbox.

#### Test for deliverability before you send
Predict whether your emails will hit the inbox or go straight to the spam folder with Inbox Placement. Test deliverability against major mailbox providers including Google, AOL, Outlook, Yahoo! and more.



mailercheck

#1 Email Verification API to verify the existence, validity & quality of any email address.

Our Email Verification API performs a comprehensive validation of email addresses in real-time and conveniently. Verify the email addresses coming from new user registrations, reduce email bouncing, block spam, and more.
#### Our email validation service via API calls checks:
**Syntax**
Check if the email address conforms to the IETF standards by using a complete syntactic email validation engine.
**If the address is branded**
Check if the address is custom and linked to a business email account or if it is generic and coming from a free email service.
**If the address is disposable**
Check if the email address is supplied by a known disposable email address provider such as Mailinator, 10MinuteMail, GuerrillaMail, and 2,000+ more.
**Mail server existence**
Check for the availability of email addresses’ corresponding domains by ensuring the existence of DNS MX records.
#### Practical usage
**Improve marketing campaign results**
In email marketing, it is important that the emails you send are verified, validated, and received by customers. One of the most common causes of email bouncing is sending to unverified email addresses.
**Segment potentially dangerous emails**
Keep potentially unverifiable email addresses such as disposable ones out of your contact list. Users signing up for freemium services with disposable email addresses may turn out to be abusers.


Top 15 Best Email Apis