concrete5/concrete5 — pull request #1849 by mlocati (2014-10-21 15:53:35+00:00)
Title: Call getmxrr only if it exists

getmxrr is available on Windows sytems from PHP 5.3, whereas concrete5 5.6 requires 5.2.4.
So, don't call getmxrr if it does not exist.