We're looking into using Zimbra and before we demo it to those above, I want to make sure it works correctly (i.e. send & receive to the outside world).
We've got it set up so it can send/receive internally, and send externally so I think I just have the MX Records left to sort out which is where I need help. This is our setup:
Domain name hosted with external company
External IP provided by LEA/ISP
Internal zimbra box sitting with an internal IP
We have web forwarders setup up, for example:
schoolname.comforwards goes to external IP xxx.xxx.xxx.xxx, our ISP's router deals with the request and forwards it on to our internal IP xxx.xxx.xxx.xxx.
I have no idea about how to set up MX so any help. I obviously know I need to set up MX records on my externally hosted domain name (as this is the domain used in the email address), but what do I point these to? I ask because you can only point MX to a domain name, and our external interface only has an IP address
Also, what do I need to ask our ISP to set up (in terms of port forwarding etc).
mail.domain.com A xxx.xxx.xxx.xxx
mail.domain.com MX domain.com
Is that right? The thing is, our website is hosted externally so domain.com is forwarded to a different address, not our external one.
domain.com A xxx.xxx.xxx.xxx www.domain.com A xxx.xxx.xxx.xxx
mail.domain.com A yyy.yyy.yyy.yyy
domain.com MX 10 mail.domain.com
where xxx is your external website IP, and yyy is your mail server IP. When a host wants to send you mail, it looks up the MX records, orders them in priority with that number, then looks up the right-hand side to get an IP address for final delivery. Visitors trying to find your website ask for domain.com or www.domain.com and get a different IP, the one where your external site is hosted.
Thanks! Starting to make sense now! Next problem. The school Domain Name is served from my personal hosting company (to keep it all together), and it uses CPanel - I can't find anywhere in CPanel to add an A Record. I can add MX records, but can't find A records.
What I did for others was add a 'forwarder' (so for subdomain.domain.com I have added a forwarder to xxx.xxx.xxx.xxx). Is this the same as an A record in CPanel? Or should I be looking for something different?
Last edited by Hightower; 2nd July 2009 at 10:41 AM.