How to find mail id is valid or not

There are several ways to check if an email address is valid or not. Here are a few methods:

Use a regular expression: You can use a regular expression to validate an email address. Here's an example:
```
^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$
```
This regular expression matches most common email address formats. You can use this in your programming language of choice to validate email addresses.
Use a library or framework: Many programming languages and frameworks have built-in libraries or modules that can help you validate email addresses. For example:
- In Python, you can use the email module: import email; email.utils.parseaddr(email)
- In JavaScript, you can use the email-validator library: const validator = require('email-validator'); validator.validate('[email protected]');
Check the domain: You can check if the domain part of the email address exists by using a DNS lookup. You can use a library or API like dns in Python or dnsjs in JavaScript to perform a DNS lookup.
Check the MX record: You can check if the domain has a valid MX record by using a library or API like dns in Python or dnsjs in JavaScript to perform a DNS lookup.
Use a third-party API: There are several third-party APIs that can help you validate email addresses, such as:
- Mailgun's Email Validation API
- Sendgrid's Email Validation API
- EmailValidator.io

Here's an example of how you can use the Mailgun API to validate an email address:

curl -X GET \
  https://api.mailgun.net/v3/address/validate \
  -H 'Authorization: Bearer YOUR_API_KEY' \
  -d '[email protected]'

This will return a JSON response indicating whether the email address is valid or not.

Use a simple check: You can also perform a simple check by checking if the email address contains the @ symbol and has a valid domain part. This is not foolproof, but it can help catch some invalid email addresses.

Here's an example of a simple email validation function in JavaScript:

function isValidEmail(email) {
  const re = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/;
  return re.test(email);
}

Keep in mind that email validation is not an exact science, and there may be cases where a valid email address is not caught by these methods. However, these methods can help you catch most invalid email addresses.

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How to find mail id is valid or not