I have to deal with a mail server half-configured by a former colleague of mine.
He installed Zimbra on Ubuntu and did a basic configuration, but it seems that the mail won't work properly. If I try to send a mail (both to a "local" address or to an external one) I get a "4.3.0 temporary lookup failure" and I don't get how can I solve this issue. To test the configuration I tried with the webmail (where I get an error that tells me basically nothing) and with telnet+postifx (where I get the error above).
Is there anything I can try to make this works? I'm willing to provide any information/log that you need to help me.
Thanks in advance.