It would help if you had created a new thread instead of adding another 'me too' to an old and solved thread.
Well, if the installer says it can't find an MX record then it doesn't exist for the domain name it's checking.
Originally Posted by iavellino
As usual, run the following commands on the Zimbra server and post the output here:
dig yourdomain.com mx
dig yourdomain.com any
host `hostname` <-- type that command exactly as you see it with backticks not single quotes.