hi daimer77
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1) Do I need to have a bind server installed on Server C in order to satisfy ZCS ? Or can I just stick with my already configured DNS on Server A ?
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You should use DNS server already configured on Server A. Unless Server C is going to be a massive volume mail server, you should absolutely not setup another dns server on C, and even then there would have to be serious thought as to why you dont increase central dns server(s!) instead.
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2) The server A has an "A record" for mydomain.com called mail.mydomain.com where mail.mydomain.com points to server C with ip y.y.y.y - is this correct in zimbra terms ?
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Yes!
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3) Server C (The zimbra server) must be a DNS master for it's own domain in this case: mail.mydomain.com ?
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NOOOOOOOOO!
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4) So the Zimbra server DNS is master for it's own domain, and just DNS cache for all other domains ?
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NOOOOOOOOO!
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5) What I am not sure of is wether the DNS server (Server A) should have mail.mydomain.com as a fully qualified domain and not just an "A record" under the domain mydomain.com. In other words; Do I need a full domain (mail.mydomain.com and mydomain.com will be seen as different domains) for the ZCS or can I just use a plain "A record" for the name mail.mydomain.com in the mydomain.com file ?
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Do not setup FQDNs in DNS - it is possible of course to specify absolute hierarchies but rarely is it a good idea. Setup an MX and A record for your mailserver in the appropriate zone file. In this case with a bind server on A, something like this in the mydomain.com.zone:
(mail.mydomain.com. IN A y.y.y.y - this would work, but not recommended)
mail IN A y.y.y.y
mydomain.com. IN MX 10 mail.mydomain.com.
The MX record should not be an IP address or a CNAME, it should point to an existing FQDN (which you've just setup in the line before).
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Sorry for my relative long list of questions but I really need some clarification, since I seem to misunderstand the terminolgy in the documentation.
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Hey, absolutely no problem. Trouble is, mail servers have always traditionally been setup by sysadmins who should know all this stuff as basic fundamental of their job. However, with the advent of packages like zimbra which are so easy to install and use, it has completely changed the demographics of who uses it, which is fantastic. I'm a longtime sysadmin and although it's occasionally exasperating to see the same questions asked over and over in the forum, its also great to people trying this sort of software who would never have stood a snowballs chance in hell with other existing opensource software. Zimbra has completely turned round a previously stagnant and embarassingly crude sector of the opensource market, thankyou Zimbra
