Forward emails from Vserver to Zimbra

[otti]

Hi!

I'm using Zimbra Collaboration Suite 60 days Trial.
Now I've got one Problem I'm using Dyndns for naming and
and my provider blocks port 25 input so my idea.

I'd like to use my Vserver to hold the emails (if my server at home is down) and then Zimbra(at my server at home) get the emails from the vserver like a relay.
1) Is this possible with Zimbra (DNS, and so on)?
2) If it's possible what's the best way to do that?
Which software is the best for my vserver?

Regrads
otti