如何使用 PHP 检查电子邮件地址是否真实或有效

问题描述：

我发现一些网站声称可以验证电子邮件地址是否有效.是否可以仅使用 PHP 来检查电子邮件地址是否有效?

I found some websites that claim to verify if email addresses are valid. Is it possible to check if an email address is valid using just PHP?

<?php
    if($_POST['email'] != ''){
        // The email to validate
        $email = $_POST['email'];

        // An optional sender
        function domain_exists($email, $record = 'MX'){
            list($user, $domain) = explode('@', $email);
            return checkdnsrr($domain, $record);
        }
        if(domain_exists($email)) {
            echo('This MX records exists; I will accept this email as valid.');
        }
        else {
            echo('No MX record exists;  Invalid email.');
        }
    }
?>
<form method="POST">
    <input type="text" name="email">
    <input type="submit" value="submit">
</form>

这就是我现在所拥有的.它检查域是否存在，但它不能检查域是否存在用户的电子邮件存在于该域中.是否可以使用 PHP 来做到这一点?

This is what I have right now. It checks if the domain exist, but it cannot check if the user's email exist on that domain. Is it possible to do that using PHP?

答

您应该检查 SMTP.

You should check with SMTP.

这意味着您必须连接到该电子邮件的 SMTP 服务器.

That means you have to connect to that email's SMTP server.

连接到 SMTP 服务器后，您应该发送以下命令:

After connecting to the SMTP server you should send these commands:

HELO somehostname.com
MAIL FROM: <no-reply@gmail.com>
RCPT TO: <emailtovalidate@domain.com>

如果您收到 Relay access denied"，则表示此电子邮件无效.

If you get "<emailtovalidate@domain.com> Relay access denied" that means this email is Invalid.

有一个简单的 PHP 类.你可以使用它:

There is a simple PHP class. You can use it:

http://www.phpclasses.org/package/6650-PHP-Check-if-an-e-mail-is-valid-using-SMTP.html

如何使用 PHP 检查电子邮件地址是否真实或有效

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