Jul 9 10:48:22 loki postfix/qmgr[3635]: 952866272C: from=<123@ccron.cu>, size=506, nrcpt=1 (queue active)
Jul 9 10:48:22 loki roundcube: User 123@ccron.cu [192.168.30.191]; Message for postmaster@ccron.cu; 250: 2.0.0 Ok: queued as 952866272C
Jul 9 10:48:22 loki postfix/smtp[17497]: 952866272C: to=<postmaster@ccron.cu>, relay=none, delay=0.33, delays=0.15/0.17/0.01/0, dsn=5.4.6, status=bounced (mail for ccron.cu loops back to myself)
Jul 9 10:48:22 loki postfix/cleanup[17490]: EDB1162739: message-id=<20130709144822.EDB1162739@loki.ccron.cu>
Jul 9 10:48:23 loki postfix/qmgr[3635]: EDB1162739: from=<>, size=2259, nrcpt=1 (queue active)
Jul 9 10:48:23 loki postfix/bounce[17499]: 952866272C: sender non-delivery notification: EDB1162739
Jul 9 10:48:23 loki postfix/qmgr[3635]: 952866272C: removed
Jul 9 10:48:23 loki postfix/smtp[17497]: EDB1162739: to=<123@ccron.cu>, relay=none, delay=0.07, delays=0.03/0.02/0.02/0, dsn=5.4.6, status=bounced (mail for ccron.cu loops back to myself)
Jul 9 10:48:23 loki postfix/qmgr[3635]: EDB1162739: removed
Jul 9 10:48:23 loki postfix/smtpd[17487]: disconnect from localhost[127.0.0.1]

Please some body , help me about, this mail, work fine sending mail to outside, but e-mail form outdoor and internal, don't have delivery notification, please help me
Sorry for my ugly English.

Tks a lot

Here is a config files:
1- Attachment 12892 main.cf

2- Attachment 12893 master.cf

3- Attachment 12894 transport

^^ This.
You need to add ccron.cu to mydestination (or specify it as a local domain some other way).

I do this, but this error appear :

Error SMTP (550): No se ha podido establecer remitente "123@ccron.cu" (5.1.1 <123@ccron.cu>: Recipient address rejected: User unknown in local recipient table)

please help me !!!!

in /var/log/mail appear:

Jul 15 17:17:33 loki postfix/smtpd[2978]: disconnect from localhost[127.0.0.1]
Jul 15 17:17:34 loki postfix/smtpd[2978]: connect from localhost[127.0.0.1]
Jul 15 17:17:34 loki postfix/smtpd[2978]: NOQUEUE: reject: RCPT from localhost[127.0.0.1]: 550 5.1.1 <123@ccron.cu>: Recipient address rejected: User unknown in local recipient table; from=<postmaster@ccron.cu> to=<123@ccron.cu> proto=ESMTP helo=<192.168.16.111>
Jul 15 17:17:34 loki roundcube: SMTP Error: SMTP error: Failed to add recipient '123@ccron.cu' in /srv/www/roundcubemail-0.8.6/program/include/main.inc on line 1485 (POST /mail/?_unlock=loading1373922533533&_lang=undefined?_task=mail&_action=send)
Jul 15 17:17:34 loki postfix/smtpd[2978]: disconnect from localhost[127.0.0.1]
Jul 15 17:17:44 loki postfix/smtpd[2978]: connect from localhost[127.0.0.1]
Jul 15 17:17:44 loki postfix/smtpd[2978]: NOQUEUE: reject: RCPT from localhost[127.0.0.1]: 550 5.1.1 <123@ccron.cu>: Recipient address rejected: User unknown in local recipient table; from=<postmaster@ccron.cu> to=<123@ccron.cu> proto=ESMTP helo=<192.168.16.111>
Jul 15 17:17:44 loki roundcube: SMTP Error: SMTP error: Failed to add recipient '123@ccron.cu' in /srv/www/roundcubemail-0.8.6/program/include/main.inc on line 1485 (POST /mail/?_unlock=loading1373922543918&_lang=undefined?_task=mail&_action=send)
Jul 15 17:17:44 loki postfix/smtpd[2978]: disconnect from localhost[127.0.0.1]
Jul 15 17:20:00 loki clamd[2415]: SelfCheck: Database status OK.

So is "123" a valid user or alias on the system?
If not, then it is working as expected.

Yes is a valid user on my domain like postmaster.

Tks and continue with the help.

Well this says "unknown user" so your user lookup is broken.
What mechanism are you using to validate users?
Are they system or virtual?
Lookup table or db or .... ?