Step-by-step guide: How to use an API to validate email addresses

api validar direcciones de correo electrónico

Email communication is ubiquitous in our daily lives, with nearly 300 billion emails sent and received daily. This volume highlights the importance of maintaining clean and up-to-date mailing lists, not only to ensure the effectiveness of mail marketing campaigns, which can yield a return of $42 for every dollar invested, but also to avoid bounces and eliminate risky contacts. Email validation is presented as a crucial tool to preserve the quality of these lists, a process in which approximately 23% of a database becomes obsolete annually [1].

In this context, using an API to validate email addresses allows you to perform mass validations in an effective manner, integrating directly with our platforms and workflows. In our article, we will explain how an email validation API can transform mailing list management, guiding you through the process of selecting the right API and showing you step-by-step how to integrate these solutions into your systems. We will also highlight best practices in email validation to maximize your effectiveness and efficiency, ensuring that your email communication is always relevant and reaches its destination.

What is an email validation API?

An email validation API, such as the one offered by Verificaremails, is an essential tool for any business or individual looking to maintain a high quality email list. This technology allows you to verify the validity of email addresses in real time, which is crucial to ensure effective delivery of email communications and maximize conversion rates. Here’s a breakdown of how it works and the benefits it offers:

  • Main Characteristics:

    • Syntax check:
      Checks that the email formatting complies with established standards (e.g., [email protected]).

    • Domain verification:
      Ensures that the email domain (the part after @) is a registered domain and capable of receiving mail.

    • Detection of disposable e-mails

      Identifies and filters temporary email addresses that are often used to avoid long-term subscriptions.

    • Typo prevention:
      Detects and corrects common errors in email addresses, such as “gnail.com” instead of “gmail.com”.
  • Integration and Use:
    • By integrating with registration forms, the Verificaremails API prevents the addition of undeliverable email addresses from the start, improving the overall quality of the mailing list.
    • In addition, it can be integrated with email marketing tools, approving and validating email lists as they are uploaded.
  • Benefits of Using an Email Validation API:

    • Build a healthy mailing list:
      By eliminating invalid or risky addresses, you improve the overall quality of your list.

    • Supports good inbox placement:
      By ensuring that emails are sent to valid addresses, you reduce the risk of being flagged as spam.

    • Encourages better interaction:
      By reaching real recipients, you increase the chances of interaction with the content sent.

    • Increase conversion rates:
      A clean, high-quality mailing list is more likely to generate conversions.

To start using the Verificaremails email validation API, simply sign up for a validation service and get an API key to integrate into your online platform. You can find more information and access the complete API documentation at Verificaremails. Also, explore how Verificaremails integrates with Zapier for email verification, offering even more flexibility and efficiency in managing your email lists.

How to choose the API to validate e-mails

When choosing an API to validate email addresses, it is crucial to consider several aspects to ensure efficient integration and accurate results. Here is a guide to selecting the right API:

  • Service Offering
    Ensure that the API offers a wide range of services to suit your specific needs. This can include everything from basic mail syntax validation to domain verification, MX records, and detection of disposable emails. Verificaremails is a provider that meets these requirements, also offering integration with Zapier for email verification, which expands the possibilities of automation and efficiency in the management of your email lists.

  • Regulatory Compliance

    It is essential to select an API that complies with data protection regulations such as GDPR and CCPA. This not only protects your company against possible sanctions, but also ensures the confidence of your customers knowing that their data is being handled with due care. Verificaremails guarantees compliance with these regulations, thus offering a reliable and secure service.

  • Ease of Integration and Testing

    • Free Trial and Flexible Plans
      Look for providers that offer free trials or a certain number of verifications at no cost. Verificaremails, for example, offers a free plan with 25 validations per day, allowing you to evaluate the quality of the service before committing to a paid plan.

    • Documentation and Support
      Access detailed documentation and efficient technical support to facilitate integration. At Verificaremails, you will find complete guides and support to integrate the email validation API into your platform in a simple and effective way.

    • Open Source SDK
      The availability of an open source SDK is a plus, as it further simplifies the integration process for developers. This allows quick and efficient adaptation to the specific needs of your project.

By considering these key points, you will be able to select an email validation API that not only improves the quality of your mailing list, but also integrates seamlessly with your existing systems, ensuring better management of your marketing campaigns and email communications.

Step-by-step for integrating an email validation API

To successfully integrate an API to validate email addresses using Verifyemails, follow these steps:

  1. Account Creation
    • Visit Verifyemails and create an account.
    • Once registered, log in to your control panel to get your API key, essential for integration.

  2. API Integration

    • For Registration Forms
      • Integrate the API into the backend code of your registration form. This will allow real-time validation of email addresses when new subscribers sign up.
      • Use the documentation provided in Verificaremails to guide you through the integration process. Here you will find code examples in PHP, Python, Node.js, and .net, making implementation easy.

    • For Existing Contact Lists
      • Perform individual or batch checks, according to your needs. This is especially useful for cleaning up existing mailing lists.

  3. Testing and Monitoring

    • Testing
      Once the integration is complete, perform tests to ensure that email validation is working properly. Check both individual email addresses and entire lists to evaluate the efficiency of the API.

    • Monitoring
      Monitor API performance on a regular basis. This includes reviewing validation rates and any errors that may arise, thus ensuring that the validation process remains efficient and effective over the long term.

Platform Compatibility
Verifyemails integrates seamlessly with a wide range of ESPs, platforms and forms, including Hubspot, Google Sheets, ActiveCampaign, AWeber, Mailchimp, Pipedrive, WordPress, ConvertKit, WooCommerce, form builders, Zapier, Stripe, Ontraport, Shopify, and many others. This versatility ensures that no matter what tools you are using to manage your email lists or marketing campaigns, you can easily implement email validation to improve the quality of your communications.

Remember, email validation not only improves the effectiveness of your email marketing campaigns, but also contributes to maintaining a healthy and up-to-date contact list. Follow these steps to integrate the Verificaremails API and start validating email addresses efficiently.

Best practices for validating e-mails using an API

To ensure a successful implementation when using an API to validate email addresses, such as the one offered by Verificaremails, it is essential to adopt a number of best practices. These not only optimize the validation process, but also ensure regulatory compliance and data protection.

  • Regulatory Compliance and Data Security
    • Be sure to comply with data protection and privacy regulations by obtaining appropriate consent from users before collecting and processing their e-mails.
    • Implement security measures to ensure confidential and secure handling of collected information. The detailed Verificaremails documentation, accessible at this link, provides guidance on how to do this effectively.

  • Mailing List Cleaning and Maintenance
    • Use a bulk email validation service on a regular basis to keep your list clean and up to date. This includes removing duplicates, low quality emails, spam traps, bounces and more.
    • Implement an email marketing automation tool with built-in validation functionality for added convenience. Verificaremails offers integration with Zapier for email verification, facilitating automation and synchronization between platforms.

  • Integral Verification and Fraud Prevention
    • Perform various checks to ensure mail deliverability, including format verification, typo detection, free and bogus vendor detection, role detection, MX verification and SMTP verification.
    • Leverage artificial intelligence to build an email quality scoring system and detect abusive emails and spam traps. Verifyemails performs comprehensive checks, including server existence, mailbox existence, email type, disposable email detection and more, offering a 360-degree view of email health with over 30 status codes and sub-statuses.

By following these best practices, you can improve your sender reputation, increase the effectiveness of your email strategy and maintain a healthy and up-to-date contact list. Integrating an email validation API like Verifyemails into your system not only optimizes the management of your mailing lists, but also protects your platforms from user abuse and bugs, stopping recurring bot attacks and improving the success rates of your email campaigns.


Throughout this article, we have explored in detail how Verificaremails not only facilitates the task of validating email addresses, but also significantly improves the management of email lists, highlighting the importance of keeping them clean and up to date. The implementation of a validation API, such as the one offered by Verificaremails, is not only an operational necessity but an essential strategy to maximize email communication effectiveness and conversion rates. With the guidelines and steps provided, integrating this tool into your system is a financially and strategically sound action.

In addition, we underline the relevance of adopting best practices in email validation to ensure regulatory compliance and data security, fundamental aspects that Verificaremails thoroughly addresses. For those interested in optimizing their processes and ensuring maximum efficiency in their email campaigns, we suggest using our API to validate email addresses. This step not only simplifies the management of your mailing list, but also puts you at an advantage in an increasingly digitalized and competitive market.


What is the method for validating an e-mail address?

To make sure that an e-mail address really exists and is active, even if it is structured correctly, it is recommended to send a test e-mail to that address. Regular expressions alone are not capable of confirming the existence of an e-mail account.

What steps should I follow to use the Gmail API?

To use the Gmail API, you must first enable access to it. This is done by logging into Google Ad Manager, going to the “Manage Global Settings” section, flipping the “API Access” switch and confirming the Terms and Conditions. Finally, save the changes by scrolling to the bottom of the page and clicking “Save”.

How is a valid e-mail address structured?

A valid email address consists of a user name followed by an “@” and the domain, as in “[email protected]“. Usernames and domain names have specific requirements that must be met, including the use of allowed characters such as the Latin letters “a” through “z”.

How can I check if an e-mail address is genuine?

To verify the authenticity of an e-mail address, you should pay attention to the sender and the “From” field, making sure that the name and e-mail address are legitimate. It is also important to check the “To” or “To” field, the links included in the email, the way it is written and if there are suspicious attachments.