PHP的简单SMTP电子邮件验证功能?另外，值得吗? [英] Simple SMTP email validation function for php? Also, is it worth it?

问题描述

有人在PHP中通过SMTP验证电子邮件地址是否具有良好的功能?另外，值得吗?会减慢我的服务器速度吗?

Does anybody have a good function for validating email addresses by SMTP in PHP? Also, is it worth it? Will it slow down my server?

->我指的是这样的东西:

--> I am referring to something like this:

http://onwebdevelopment.blogspot.com/2008/08/php-email-address-validation-through.html

这是对电子邮件地址语法验证的补充.

which is meant to complement validation of the syntax of the email address.

虽然看起来很复杂，但我希望有一种更简单的方法.

It looks complicated though, and I was hoping there was a simpler way of doing this.

推荐答案

如果您要检查域中是否存在邮件交换器，可以使用以下命令:

If you want to check if there is a mail exchanger at the domain, you can use something like this:

/*checks if email is well formed and optionally the existence of a MX at that domain*/
function checkEmail($email, $domainCheck = false)
{
    if (preg_match('/^[a-zA-Z0-9\._-]+\@(\[?)[a-zA-Z0-9\-\.]+'.
                   '\.([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/', $email)) {
        if ($domainCheck && function_exists('checkdnsrr')) {
            list (, $domain)  = explode('@', $email);
            if (checkdnsrr($domain, 'MX') || checkdnsrr($domain, 'A')) {
                return true;
            }
            return false;
        }
        return true;
    }
    return false;
}

用法:

$validated = checkEmail('[e-mail]', true);

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