Problema Postfix - Não recebe email

[Cj]

Boa tarde. estou montando um servidor de email com posfix dovecot e ldap.
no entanto o server  so envia email mas não recebe.
peço help.

o mail.log
Sep 14 12:15:24 dc01 postfix/smtpd[4911]: disconnect from localhost[127.0.0.1]
Sep 14 12:15:24 dc01 postfix/pipe[4915]: 4BA23FFA2: to=<tmail@umbeluzi.org>, relay=dovecot, delay=0.24, delays=0.09/0.02/0/0.13, dsn=4.3.0, status=deferred (temporary failure)
Sep 14 12:21:53 dc01 postfix/qmgr[4578]: BB120FF90: from=<cdanca@umbeluzi.org>, size=698, nrcpt=1 (queue active)
Sep 14 12:21:53 dc01 postfix/qmgr[4578]: 4DC1CFFA0: from=<cdanca@umbeluzi.org>, size=723, nrcpt=1 (queue active)
Sep 14 12:21:53 dc01 postfix/qmgr[4578]: 4BA23FFA2: from=<cdanca@umbeluzi.org>, size=698, nrcpt=1 (queue active)
Sep 14 12:21:53 dc01 postfix/qmgr[4578]: C0D0BFF9E: from=<cdanca@umbeluzi.org>, size=712, nrcpt=1 (queue active)
Sep 14 12:21:53 dc01 postfix/pipe[4983]: BB120FF90: to=<cdanca@umbeluzi.org>, relay=dovecot, delay=2443, delays=2443/0.11/0/0.22, dsn=4.3.0, status=deferred (temporary failure)
Sep 14 12:21:53 dc01 postfix/pipe[4984]: 4DC1CFFA0: to=<cdanca@umbeluzi.org>, relay=dovecot, delay=537, delays=536/0.06/0/0.22, dsn=4.3.0, status=deferred (temporary failure)
Sep 14 12:21:53 dc01 postfix/pipe[4990]: C0D0BFF9E: to=<nildo@umbeluzi.org>, relay=dovecot, delay=1745, delays=1745/0.15/0/0.15, dsn=4.3.0, status=deferred (temporary failure)
Sep 14 12:21:53 dc01 postfix/pipe[4986]: 4BA23FFA2: to=<tmail@umbeluzi.org>, relay=dovecot, delay=390, delays=389/0.08/0/0.22, dsn=4.3.0, status=deferred (temporary failure)

agradeço desde ja.

[bruno_moita]

É um server de e-mail interno ou externo?

[fernando.linux]

seu dns ta rodando legal ??

[marcio.sfs]

Dê um nmap de uma máquina de fora da rede e veja se a porta 25 está aberta.