First I'd like to say what fantastic potential I see in Zimbra - congratulations to the people who have created such a great open source tool. I am planning to set up a small business IT system for some friends and have selected Zimbra as the Email/Calendar tool. I am waiting for the new server hardware to arrive (a week or two away) and have started trying out some stuff on a laptop. I currently have a fresh install of Ubuntu (Breezy Badger) which I plan to use as the Server OS because I have a reasonable knowledge of it. I have installed Zimbra 4.0.1_GA_324.DEBIAN3.1 (with the patches that were described elsewhere in this forum). After a couple of false starts, a bit of research and tinkering I now have 1. A better understanding of Email and 2. A working Zimbra server. At least I am able to create calendar entries and send Emails between users on the private side of the firewall.
The problem I have is getting Email out through the firewall to the rest of the world. I tried sending an email from a zimbra user to a hotmail account and it doesn't seem to have got through. I haven't started really chasing this down yet - thought I'd see if anyone here has had a similar experience or knows of a howto etc etc.
I think that getting Email in from the outside world should be OK - I was thinking about fetchmail - more investigation required there too I'm afraid.
As the business will connect to the internet with a dial on demand ISDN system I was planning on buying a domain and having the mail hosted somewhere. I would then get fetchmail to grab the mail from the host server and poke it into Zimbra.
I work as a Network engineer so have good knowledge of IP, routing,switching etc. Have a couple of years experience with Linux (various distros) but am not a guru by any means and am rapidly learning about email. Any suggestions will be greatfully accepted. If I work it out myself I'll post it here as I dare say there are others that would be setting up something similar.