Added additional DNS checker

http://pingability.com/zoneinfo.jsp for checking DNS and MX servers.

Added additional DNS checker
http://pingability.com/zoneinfo.jsp for checking DNS and MX servers.
cfa3e959 · Jonathan Medding · d186874c · cfa3e959
Commit cfa3e959 authored Apr 26, 2014 by Jonathan Medding
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 You can also debug your DKIM (and SPF) settings with e.g. [this tool](http://www.brandonchecketts.com/emailtest.php).
+[This site](http://pingability.com/zoneinfo.jsp) will also give useful information about your DNS and mail servers.