Change test domain name to one that has an MX record

Note that this is very very brittle and really should be reworked.
Fixes #534

tests/Zend/Validate/EmailAddressTest.php

@@ -633,7 +633,7 @@ class Zend_Validate_EmailAddressTest extends PHPUnit_Framework_TestCase
         }
         $validator = new Zend_Validate_EmailAddress();
         $validator->setValidateMx(true);
-        $this->assertTrue($validator->isValid('testmail@detrèsbonsdomaines.com'));
+        $this->assertTrue($validator->isValid('testmail@zürich.ch'));
     }
 }