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不用寄信 檢查 Email 是否 真實 存在 PHP
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Published:
Updated:2016-08-04 20:48:17

最近很常研究 Email,由於是自己架設伺服器,比較麻煩,所以更深入研究了一下下。

今天想到就寫一篇,真實檢查 Email 的方法,因為這個不是驗證 Email 格式與否,而是直接驗證 此Email是否存在,並且無須寄信即可以檢查。

首先先查詢 Email @後域名的MX紀錄,再查此IP,得到 IP 後即可透過 TCP 連線至該 SMTP 伺服器驗證以確立此 Email 確實存在,而不是亂打的。

//Check email is exist
var_dump(check_is_email_real_exist("test@example.com"));

function check_is_email_real_exist($email_address){
	if ((!filter_var($email_address, FILTER_VALIDATE_EMAIL)===false) and strlen($email_address)<=254){
		$emailxx=explode('@',$email_address);
		$dns_lookup_result=dns_get_record($emailxx[1],DNS_MX);
		if (count($dns_lookup_result)==0){
			return false;
		}else{
			$address=gethostbyname($dns_lookup_result[0]['target']);
			if ($address!=''){
				$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
				if ($socket === false) {
					echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n";
					return false;
				}
				$result = socket_connect($socket, $address, 25);
				if ($result === false) {
					echo "socket_connect() failed.\nReason: ($result) " . socket_strerror(socket_last_error($socket)) . "\n";
					return false;
				}
				$in = "HELO hi\r\n";
				socket_write($socket, $in, strlen($in));
				if(substr(socket_read($socket, 2048),0,3)=='220'){
					$in = "MAIL FROM:<thisistest@gmail.com>\r\n";
					socket_write($socket, $in, strlen($in));
					if(substr(socket_read($socket, 2048),0,3)=='250'){
						$in = "RCPT TO:<$email_address>\r\n";
						socket_write($socket, $in, strlen($in));
						if(substr(socket_read($socket, 2048),0,3)=='250'){
							$in = "QUIT\r\n";
							socket_write($socket, $in, strlen($in));
							if(substr(socket_read($socket, 2048),0,3)=='250'){
								return true;
							}else{
								return false;
							}
						}else{
							return false;
						}
					}else{
						return false;
					}
				}else{
					return false;
				}
			}else{
				return false;
			}
		}
	}else{
		return false;
	}
}

代碼醜陋,請各位看官不要介意。


This entry was posted in General, Experience, Functions, PHP By Weil Jimmer.

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Hi! Everyone! My name is Weil Jimmer. This is my personal blog. I'm a webmaster of this site. I hope the site will be popular. Now, Let's go! Enjoy gaining more knowledge.
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