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Originally Posted by physikal  the second DNS server is our MSDNS for our Active Directory environment. I didnt want to mix linux and windows and possibly create hassles so I just installed splitDNS. |
OK, in that case I'd just suggest you remove the MSDNS server from your resolv.conf. You're likely experiencing the zimbra server getting an incorrect response (i.e. no record) from that server. Try that and see if that resolves the problem.