can not send mail.

[harry.h]

Hi, everyone, i just installed zimbra on debian 4 for internal testing, though never get the postfix working. here comes the error log:
=======================log from zimbra.log==============================
Apr 5 00:07:56 zimbra postfix/qmgr[32196]: BA5065C4122: from=<>, size=3283, nrcpt=1 (queue active)
Apr 5 00:07:56 zimbra postfix/bounce[800]: B1A6E5C4120: sender non-delivery notification: BA5065C4122
Apr 5 00:07:56 zimbra postfix/qmgr[32196]: B1A6E5C4120: removed
Apr 5 00:07:56 zimbra postfix/lmtp[798]: BA5065C4122: to=, relay=none, delay=0.02, delays=0.02/0/0/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=zimbra.icsnetlink.com type=A: Host not found)
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zimbra.icsnetlink.com is the domain name i set in hosts file.

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127.0.0.1 localhost
127.0.1.1 zimbra.icsnetlink.com zimbra

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when i use dig to find more information, comes
======================dig localhost any=================================
;; QUESTION SECTION:
;localhost. IN ANY

;; ANSWER SECTION:
localhost. 0 IN A 127.0.0.1

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======================dig zimbra.icsnetlink.com any =================================
;; QUESTION SECTION:
;zimbra. IN ANY

;; AUTHORITY SECTION:
. 3600 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2008040301 1800 900 604800 86400


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could anybody give me some suggestion, thanks in advance!!

[phoenix]

Your hosts file is incorrect, check the details in the documentation. You will also need to have valid DNS A & MX records and if you're behind a NAT device you'll need a Split DNS set-up.