maxbanton · August 4, 2014 13:58 · Aug 4, 2014
diff --git a/SmtpEmailChecker.php b/SmtpEmailChecker.php
@@ -0,0 +1,116 @@
+<?php
+
+class SmtpEmailChecker
+{
+
+	protected $from;
+
+	protected $code;
+
+	/**
+	 * @return mixed
+	 */
+	public function getCode()
+	{
+		return $this->code;
+	}
+
+
+	public function __construct($from)
+	{
+		$this->from = $from;
+	}
+
+	public function check($email)
+	{
+		if (strpos($email, '@') === false) {
+			return false;
+		}
+
+		$mxHosts = [];
+		$weight = [];
+
+		getmxrr(explode('@', $email)[1], $mxHosts, $weight);
+
+		$mxHosts = array_combine($weight, $mxHosts);
+
+		ksort($mxHosts);
+
+		$socket = false;
+
+		foreach ($mxHosts as $mxHost) {
+
+			try {
+
+				$socket = fsockopen($mxHost, 25, $errno, $errstr, 5);
+				stream_set_timeout($socket, 5);
+			}
+			catch (Exception $e) {
+
+			}
+
+			if ($socket)
+			{
+				break;
+			}
+		}
+
+		if ($socket) {
+
+			try {
+
+				$reply = fread($socket, 2082);
+
+				$helloCode = intval(substr($reply, 0, 3));
+
+				if ($helloCode != 220) {
+					$this->code = 0;
+
+					return false;
+				}
+				else {
+
+					fwrite($socket, "HELO " . gethostname() . "\r\n");
+
+					fread($socket, 2082);
+
+					fwrite($socket, "MAIL FROM: <" . $this->from . ">" . "\r\n");
+
+					fread($socket, 2082);
+
+					fwrite($socket, "RCPT TO: <" . $email . ">" . "\r\n");
+
+					$response = fread($socket, 2082);
+
+					fwrite($socket, "quit" . "\r\n");
+
+					fread($socket, 2082);
+
+					fclose($socket);
+
+					$code = intval(substr($response, 0, 3));
+
+					$this->code = $code;
+
+					switch ($code) {
+						case 250:
+							return true;
+						case 451:
+							return true;
+						case 550:
+							return false;
+						default:
+							return false;
+					}
+
+				}
+			}
+			catch (Exception $e) {
+				error_log($e->getMessage());
+			}
+		}
+
+		$this->code = 0;
+		return false;
+	}
+}