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In the world of email verification, various terms and concepts can sometimes be a bit technical.
This glossary is here to provide clear explanations of the most commonly used terms to help you better understand the email verification process.

Anonymous User

Anonymous users have the most limitations, which are written on home page.
These limitaions include the text size you can insert in the text box, and the number of emails visible in preview.

(Confidence) Score

This number from 0 to 100 represents the likelihood the email address is valid, expressed as a percentage.
The score for Free and Disposable emails will be 50 by default, because we are not checking SMTP for these types of emails at the moment.

CSV File

A CSV (Comma-Separated Values) file is a plain text file format commonly used to store and exchange tabular data, such as spreadsheets or databases.


Email deliverability is the ability of an email to successfully reach the recipient's inbox without being marked as spam or bouncing.

Disposable Email

Disposable email addresses are temporary, often single-use email addresses created for short-term purposes.
They are commonly used to avoid spam or for one-time registrations.

Email Verification

Email verification is the process of confirming the accuracy, validity, and deliverability of an email address to ensure that it is capable of receiving emails.

Email Verification List

Email verification list refers to a compilation of email addresses that require confirmation or validation through a verification process.

Email Verification List Status

Email Verification List can have a certain status, depending on your limits as a user, and the progress of the verification process.
Created - this means that you have successfully inserted the text with email addresses in the text box, and that a verification process can start
In progress - this means that the verification process is running
Preview - the verification process is completed for a limited number of email addresses based on your user rights.
You can view the full results for this subset of emails.
To verify all uploaded emails and access complete results for each address, you need to purchase the full list
Completed - the verification process is finished, the entire list of emails is verified, but you have limited access to the full results, based on your user rights
Approved - the verification process is finished, the entire list of emails is verified, and you have the right to view the full results for all the uploaded email addresses
Deleted - the list you have erased yourself. According to GDPR, neither you nor us can restore a deleted list

Hard Bounce

A hard bounce occurs when an email is sent to an invalid or non-existent address, resulting in a permanent delivery failure.

Invalid Email

An invalid email address is one that does not adhere to the correct format or is associated with a non-existent domain or mailbox.

MX Records

MX (Mail Exchange) records are DNS records that specify the mail servers responsible for receiving email messages on behalf of a domain.
They play a crucial role in email delivery.

Non-Recurring Subscription

Non-recurring subscription refers to a subscription plan that does not automatically renew at the end of the billing period.
With a non-recurring subscription, you make a one-time payment for a set duration (such as a month or a year) and do not need to manually cancel to avoid automatic renewal.
Once the subscription period expires, you must initiate a new purchase if you wish to continue the subscription.


A request made by a customer to purchase a specific product or service.
It includes details such as the type and quantity of items, and payment method.


A property refers to attributes or characteristics associated with an email address.
These properties can include information about the email address's validity, deliverability, and status.
Each property has one of these statuses: pass, fail, unknown, notused.

Registered User

Registered users have fewer limits than anonymous users.
These limits are written on the profile page, and include the text size you can insert in the text box, and the number of emails visible in preview.

Role-Based Email

A role-based email address is associated with a specific job or function, such as "support@domain.com" or "info@domain.com."
They are not tied to a specific person but rather a role or department.

SMTP Server

Simple Mail Transfer Protocol (SMTP) is the standard for sending emails over the internet.
An SMTP server is a computer that sends, receives, and relays email messages between senders and receivers.

Soft Bounce

A soft bounce happens when an email cannot be delivered temporarily, often due to issues like a full mailbox or a temporary server problem.
Unlike hard bounces, soft bounces are temporary issues.

Spam Trap

A spam trap is an email address specifically created to catch spammers.
Sending emails to a spam trap can harm your sender reputation.

Valid Email

A valid email address is one that adheres to the correct format, has an existing mailbox on the associated domain, and can receive emails.