[jdp459]

Zimbra isn't responsible for your DNS settings. You are. There are many excellent tutorials and complete books on DNS available. I can recommend the O'Reiley book - when we had an issue many yrs ago, I read about 10 pgs and never used it again.

Further, there are many different setups for email, so you are asking them to explain 50 different DNS setups too. Your setup could be different still.

Whether your ISP needs to be involved with DNS is also unknown. My ISP knows nothing at all about my DNS records. If you are paying for an all-in-one hosting service, then your ISP probably has a DNS settings panel to control it. Since your panel controls aren't the same as my panel controls and neither match zone files, exact examples would probably confuse more than help. However, don't forget the trailing '.' character. IT IS USUALLY VERY IMPORTANT.

For us, DNS is performed elsewhere. We like to keep DNS, hosting and domain registration at different companies, so when there is a failure at 1 company, it isn't a HUGE deal to move the service AND 1 company can't completely take our site down, they can just make it difficult.

If you need examples, use `dig` (a DNS query tool) and query DNS records for any other domains you like. It isn't like the settings can be hidden. Some examples

$ dig mail.google.com
$ dig mail.google.com mx
$ dig mail.zimbra.com
$ dig mail.zimbra.com mx