You must check MX records for 'headwatersproperty. com' and not 'mail. headwatersproperty. com'
Your nameservers are not replying with any MX record for the domain:
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nslookup -type=mx headwatersproperty .com NS1. YOURCUSTOMIDX. COM
Server: NS1. YOURCUSTOMIDX. COM
Address: 64.71.237.246#53
*** Can't find headwatersproperty .com: No answer
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nslookup -type=mx headwatersproperty. com NS2. YOURCUSTOMIDX. COM
Server: NS2. YOURCUSTOMIDX. COM
Address: 64.71.237.247#53
*** Can't find headwatersproperty. com: No answer
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Please ensure they are correctly created.