host name lookup failure - Error opening or locking INBOX
I am a newbie on linux. Someone setup our mail server may be outsource the setup and config. i am assign to administer it. the problem would be when we are sending mail to other domain, the mail log says: Name server: yahoo.com.: host name lookup failure.
Another error I encounterd is: Error opening or locking INBOX.
any one who can help me?
we are using REDHAT AS 3.0 update 5 with SendMail as our MTA.
your help is highly appreciated.
thanks in advance.