I hope that I haven't missed this elsewhere, but googling and searching here have not helped me yet...
I upgraded from 7.5.6 to 7.5.10 on my previous server (debian etch) and then restored a backup of that /opt/zimbra on to a new server (ubuntu 6.06).
Presumably I have somehow mucked up the dns, hosts file or something, even though I copied them straight from the previous install:
127.0.0.1 zimbra.xxx.co.uk zimbra
Now I realise that this is not the conventional setup, but it worked before, and I was following the howto for debian etch.
Now I can send and receive external mail, but for mail within the domain I get:
Dec 19 11:48:17 zimbra postfix/qmgr: BCA369E0059: to=
, relay=none, delay=0, status=deferred (delivery temporarily suspended: connect to zimbra.scisite.co.uk[184.108.40.206]: Connection timed out)
I have tried various instructions for etc/hosts, resolv.conf and hostname, but with no success. All suggestions gratefully received!