Hi jB,
I really don't see the need of migrating your server only for changing hostname (ip is absolutely indipendent for zimbra enviroment), because the local server hostname can differ from your public hostname without any issue, unless you need to communicate with another server that has your old hostname.
If your zimbra system account belong to domain mail.mysite.com (e.g. ham.XXXX@mail.mysite.com) you can easly rename from mysite.com to mysite.net without any problem (see "zmprov -l rd"). You need only to adjust (beyond local ip and dns) is to change the smtp_helo_name setting:
Code:
$ zmlocalconfig -e postfix_smtp_helo_name="newmail.mysite.net"
to reflect your new public hostname and reverse DNS record (PTR). You can also set the zimbraPublicServiceHostname property of all your other zimbra domains (if you have more domains).
My 2 cents.
D0s0n
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