How to check mail id exist or not

There are several ways to check if an email address exists or not:

Using a simple HTTP request: You can send a GET request to the email address with a specific format, such as mailto:[email protected]. If the email address exists, the server will return a 200 OK response. If it doesn't exist, the server will return a 404 Not Found response.
Using a mail client library: You can use a mail client library such as Python's smtplib or Java's JavaMail to connect to a mail server and check if the email address exists. For example, you can try to send a test email to the address and see if it bounces back.
Using a third-party API: There are several third-party APIs available that allow you to check if an email address exists or not. Some popular options include:
- MailboxLayer: A paid API that provides email verification and validation services.
- EmailVerify: A free API that allows you to verify email addresses.
- VerifyEmail: A free API that allows you to verify email addresses.
Using a DNS lookup: You can perform a DNS lookup to check if the email address exists. For example, you can check if the MX record for the domain exists. If it does, it's likely that the email address exists.

Here are some examples of how you can use these methods in different programming languages:

Python:

import smtplib

def check_email_exists(email):
    try:
        server = smtplib.SMTP('smtp.gmail.com', 587)
        server.starttls()
        server.login('[email protected]', 'your_password')
        server.quit()
        return True
    except smtplib.SMTPRecipientsRefused:
        return False

email = '[email protected]'
if check_email_exists(email):
    print(f"{email} exists")
else:
    print(f"{email} does not exist")

Java:

import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;

public class EmailChecker {
    public static boolean checkEmailExists(String email) {
        try {
            Session session = Session.getDefaultInstance(new Properties(), null);
            Transport transport = session.getTransport();
            transport.connect("smtp.gmail.com", 587, "[email protected]", "your_password");
            transport.close();
            return true;
        } catch (Exception e) {
            return false;
        }
    }

    public static void main(String[] args) {
        String email = "[email protected]";
        if (checkEmailExists(email)) {
            System.out.println(email + " exists");
        } else {
            System.out.println(email + " does not exist");
        }
    }
}

Node.js:

const mailgun = require('mailgun-js');

function checkEmailExists(email) {
    const mg = mailgun({
        apiKey: 'your_api_key',
        domain: 'your_domain'
    });

    mg.get(`v3/users/${email}`, (error, response) => {
        if (error) {
            return false;
        }
        return true;
    });
}

const email = '[email protected]';
checkEmailExists(email).then((exists) => {
    if (exists) {
        console.log(email + " exists");
    } else {
        console.log(email + " does not exist");
    }
});

Note that these examples are just demonstrations and may not work in all cases. Additionally, some methods may require additional setup or configuration to work correctly.

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How to check mail id exist or not