As a newbee to all this stuff I have to ask you pros wether my idea is totaly crazy or wether it might be possible to achive.

I don't actually want zimbra to be my mailsever. I "just" want it to be my mailbox server.
Let me explain: I've got email accounts on 2 different mailservers, which are out of my administrative juristiction. But I want to have my emails on a central server in order to access them from different clients/workstations (PC, laptop, mobile). But I still want to be able to send an email using my usual mailaccounts.
So I guess I want zimbra to relay emails I want to send to the actual mailservers as well as receive emails from my actual mailservers and put them into my centralized mailbox.

I hope I described sufficiently..

thx for your help in advance