diff --git a/src/Egulias/EmailValidator/EmailValidator.php b/src/Egulias/EmailValidator/EmailValidator.php
index 4325dd7..69ff5fc 100644
--- a/src/Egulias/EmailValidator/EmailValidator.php
+++ b/src/Egulias/EmailValidator/EmailValidator.php
@@ -184,7 +184,10 @@ public function getThreshold()
      */
     protected function checkDNS()
     {
-        $mxRecordExists = checkdnsrr(trim($this->parser->getParsedDomainPart()), 'MX');
+        $host = $this->parser->getParsedDomainPart();
+        $host = rtrim($host, '.') . '.';
+
+        $mxRecordExists = checkdnsrr($host, 'MX');
 
         if (!$mxRecordExists) {
             $this->warnings[] = self::DNSWARN_NO_RECORD;