You may want to manually check your MX records / A records ( I had a few MX problems and had to resolve them by editing the dns records by hand).
I checked for your domain's mx records and this is what I got from dnsstuff.com
Quote:
MX FAIL MX Category ERROR: I couldn't find any MX records for liquidlightning.com. If you want to receive E-mail on this domain, you should have MX record(s). Without any MX records, mailservers should attempt to deliver mail to the A record for liquidlightning.com. I can't continue in a case like this, so I'm assuming you don't receive mail on this domain.
Mail FAIL Connect to mail servers ERROR: I could not find any mailservers for liquidlightning.com.
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check etc/bind/pri.liquidlightning.com to see if it is correct