The ip linked to your mail server is on a blacklist with BACKSCATTERER, and my exchange server doesn't like that. I'll send it through gmail & see if that works. Check out: http://www.mxtoolbox.com/ Put in your domainname k5ktf.com, click lookup, and then click "Blacklist Check" by mail.k5ktf.com Hopefully you can contact them, and get it removed as a bunch of mail servers check the blacklists.
Rich ~ W5RCH
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