Problem with mail server configuration (sendmail)

I have Virtualmin Virtual Servers Version 3.41.gpl

My problem is the mail server configuration (sendmail), the system send me the following messages:

The original message was received at Thu, 12 Jul 2007 16:50:05 -0400 from smmsp@localhost [127.0.0.1]

----- The following addresses had permanent fatal errors -----
<root@debian.cav-dom>
(reason: 553 5.3.5 system config error)

----- Transcript of session follows -----
553 5.3.5 localhost.cav-dom. config error: mail loops back to me (MX problem?)
554 5.3.5 Local configuration error

The original message was received at Thu, 12 Jul 2007 16:50:05 -0400 from localhost with id l6CKo5BO013936

----- The following addresses had permanent fatal errors -----
<root@debian.cav-dom>
(reason: 553 5.3.5 system config error)

----- Transcript of session follows -----
554 5.3.5 Local configuration error

Help me please.

Thanks.

Post edited by: SimonPequeno, at: 2007/07/13 23:27<br><br>Post edited by: SimonPequeno, at: 2007/07/14 17:56

I configured cav.cl domain, but I cannot receive emails from external domains.

There are some emails that are in queue.

Example where I flush queue:

Running /var/spool/mqueue/l6DFhREr020864 (sequence 1 of 1) <cencina@falernia.com>... Connecting to falernia.com. via esmtp... 220-cpanel.cpanel.cl ESMTP Exim 4.66 #1 Tue, 17 Jul 2007 12:15:27 -0400 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. >>> EHLO cav.cl 250-cpanel.cpanel.cl Hello cav.cl [200.27.207.76] 250-SIZE 52428800 250-PIPELINING 250-AUTH PLAIN LOGIN 250-STARTTLS 250 HELP >>> STARTTLS 220 TLS go ahead >>> EHLO cav.cl 250-cpanel.cpanel.cl Hello cav.cl [200.27.207.76] 250-SIZE 52428800 250-PIPELINING 250-AUTH PLAIN LOGIN 250 HELP >>> MAIL From:<www-data@cav.cl> SIZE=2536 250 OK >>> RCPT To:<cencina@falernia.com> >>> DATA 451 Could not complete sender verify callout <cencina@falernia.com>... Deferred: 451 Could not complete sender verify callout 503 valid RCPT command must precede DATA >>> RSET 250 Reset OK Closing connection to falernia.com. >>> QUIT 221 cpanel.cpanel.cl closing connection

What happens??

More details, the DNS records:

$ttl 38400
@ IN SOA debian. root.debian. (
1182958926
10800
3600
604800
38400 )
cav.cl. IN NS debian.
cav.cl. IN A 192.168.0.150
www.cav.cl. IN A 192.168.0.150
ftp.cav.cl. IN A 192.168.0.150
m.cav.cl. IN A 192.168.0.150
mail.cav.cl. IN A 192.168.0.150
cav.cl. IN MX 5 mail.cav.cl.