How does email verification work?

Email verification is an essential process to ensure that the email addresses in your contact list are valid and active. This process helps reduce bounce rate and improves the effectiveness of email campaigns. Below is an explanation of how it works and what steps are involved.

How does Verify Email Addresses work?

Email address verification is a process that involves several steps to ensure that the email addresses on your list are valid and able to receive emails. The main steps are described below:

  1. Syntax and Formatting First, check that the e-mail address is correctly formatted. This includes checking for typographical errors and correct structure (e.g., [email protected]).
  2. Domain Verification Checks if the e-mail domain exists and is active. This can be done by performing a DNS query to verify that the domain has valid MX (Mail Exchange) records, indicating that it can receive emails.
  3. Mail Server Query A connection is established with the domain’s mail server to verify if the e-mail address is valid and active. This is done without sending a real e-mail, using SMTP protocol commands to simulate sending.
  4. Inbox Verification Some advanced tools can verify if the email address inbox is active and can receive emails, although this step can be more invasive and is not always used.
  5. Checking Against Databases You can check the email address against databases of emails known to be false, temporary or dangerous.

email verification service

Email Verification Tools

There are several online tools and services that facilitate the verification of e-mail addresses. These tools can perform the steps described above automatically and in bulk, which is especially useful for large mailing lists. Some of the features they can offer include:

  • Real Time Verification Ideal for registration forms where you want to validate the e-mail address at the moment the user enters it.
  • Bulk Verification Allows you to upload large lists of emails and verify all addresses at once.
  • Reports and Statistics They provide details on the validity of the addresses and possible problems detected.

Benefits of Email Verification

  • Bounce Rate Reduction By sending emails only to valid addresses, you reduce the number of emails that bounce.
  • Improved Deliverability Email campaigns are more effective when sent to valid addresses.
  • Sender Reputation Protection Maintaining a clean email list helps protect the reputation of the sender’s domain and avoid being flagged as spam.


Email address verification is a crucial process for any effective email marketing strategy. Using email verification tools helps ensure that sent emails arrive in valid inboxes, thus improving the deliverability rate and effectiveness of campaigns. By understanding and using this process, you can keep your email list clean and optimize your digital marketing efforts.

To see in detail the validation procedure visit the section  how to verify emails. You will be able to see specific cases and the table with all the validation results.