Are you ok with starting from scratch? -easier than changing your hostname
(see all the troubles with changing your zimbrahostname here:
ZmSetServerName - ZimbraWiki)
Follow all the uninstall directions (
UnInstall Zimbra - ZimbraWiki)
Change your hostname (in that 'Under the DNS tab in Network configuration') to mail.mpseast.com & reboot
your /etc/hosts file should look like
127.0.0.1 localhost.localdomain localhost
x.x.x.x.x mail.mpseast.com mail
Then once your back up and running in zimbra admin console:
So your email address isn't
user@mail.mpseast.com you'll just create another domain 'mpseast.com' and make the new users there. You can easily (with a drop down) change what domain a user belongs too, but be careful with the admin account. (leave the mail.mpseast.com alone for now-it'll be setup to get admin emails etc)
Now you don't have to do split dns -you could just not use external ip/resolution/ with your static public IP for everything.
But you had said "DNS server on our classroom network" (what you would be doing instead of bind)
Split DNS - ZimbraWiki /blog/archives/2007/06/making_zimbra_bind_work_together_1.html
OR
You send outbound mail through an existing server (if the school would allow you to connect)
Quote:
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An alternative to setting up a DNS server is to un-check "Enable DNS Lookups" on the MTA tab under Server configuration on the Zimbra Admin console. This requires a relay MTA to be configured somewhere that will accept all outbound email.
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OR
lastly, there's the zimbraMailTransport mapping attribute
Incoming Mail Problems - ZimbraWiki
not your issue but for later there's also:
Outgoing Mail Problems - ZimbraWiki