We have Zimbra 5.05_GA on Ubuntu 6.06 LTS running great on our network with Exchange Server 2007. One problem that I am having is that when I send email from Zimbra to Exchange account, the email gets deferred.
Zimbra local ip : 192.168.0.111
Exchange local ip: 192.168.0.118
I have already setup internal dns server.
The error under /var/log/zimbra.log shows
Jun 5 15:59:09 localhost postfix/smtp: 609964582C1: to=
, relay=none, delay=19560, delays=19522/0/38/0, dsn=4.4.1, status=deferred (connect to mail.exchangedomain.org[xx.xx.xx.xx]: Connection timed out)
xx.xx.xx.xx = external ip
dig mail.exchangedomain.org gives external ip.
I also updated /etc/hosts
127.0.0.1 localhost.localdomain localhost
I don't want to disable the dns lookups as we need to send external emails.
I would appreciate if someone can point me in the right direction.
Thank you in advance.