I have finished setting up my Zimbra Server and all seems to work OK with the exception that I am unable to send emails to GMAIL accounts. I do get an error in the logs stating that the connection has timed out. If I Enable DNS Lookups in the Global Configuration (MTA) then I am able to send emails to GMAIL accounts but all my incoming emails are deferred. If I Uncheck the option then All my incoming emails are delivered but I am unable to send to GMAIL accounts. Very odd (at least for me). Sending to other accounts seems to work ok. Any suggestions on what I should look at here? Thanks!