[captain7616]

Hi All,
I am a zimbra newbie, and have migrated my entire mail server over to it, its about 100 users, with about 20 domains in total,

The issue I am having is that I when I send mail it mostly works on most domains, but on some domains it bounces the mail back to me with unable to look up host wlsh.co.za: Name or service not known which is not hosted locally on the server, but 99% of my other mail goes out fine,

I am not using an upstream smtp as I have an uncapped solutiona and the ISP for that dont supply upstream smtp but I am pretty sure I have configured it correctly , when I do a dig of the mx record it resolves with no problem here is the dig of the domain's mx record , also I also run my own internal dns server on another server on the internal network (bind9)
zimbra:~# dig mx wlsh.co.za

; <<>> DiG 9.3.4 <<>> mx wlsh.co.za
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63280
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 0

;; QUESTION SECTION:
;wlsh.co.za. IN MX

;; ANSWER SECTION:
wlsh.co.za. 73901 IN MX 5 mx1.mweb.net.

;; AUTHORITY SECTION:
wlsh.co.za. 21167 IN NS ns2.mweb.co.za.
wlsh.co.za. 21167 IN NS ns1.mweb.co.za.

;; Query time: 12 msec
;; SERVER: 10.0.200.12#53(10.0.200.12)
;; WHEN: Wed Apr 15 19:17:45 2009
;; MSG SIZE rcvd: 97


Is there possibly a setting or something that I may have overlooked, and someone could assist me, I would be most grateful,

Kind regards

Brad