Recipient address rejected: Domain not found (and others problems)

[spanish]

Hello,

My server:
Domain name: ksXXXXXX.kimsufi.com (OVH)
Operative System: Debian 4.0 (Etch) 64 bits -new installation-

I have installed ispCP 1.0.0 RC6:

Please enter a fully qualified hostname. [ksXXXXXX.kimsufi.com]:
Please enter system network address. [XX.XX.X.XXX]:
Please enter the domain name where ispCP OMEGA will run on [admin.ksXXXXXX.kimsufi.com]:
Please enter SQL server host. [localhost]:
Please enter system SQL database. [ispcp]:
Please enter system SQL user. [root]:
Please enter system SQL password. [none]: myrootpassword
Please enter ispCP ftp SQL user. [vftp]:
Please enter ispCP ftp SQL user password. [auto generate]: myvftppassword
Please enter ispCP phpMyAdmin Control user. [pma]:
Please enter ispCP phpMyAdmin Control user password. [auto generate]: autogeneratedpassword
Please enter administrator login name. [admin]:
Please enter administrator password: myadminpassword
Please enter admininistrator email address: mymail@mydomain.org
IP of Secondary DNS. (optional) []: XXX.XXX.XX.XXX
Use MySQL Prefix.
Possible values: [i]nfront, [b]ehind, [n]one. [none]:
Activate AWStats. [no]:

Problem 1:
I can't access to control panel of ispCP in http://admin.ksXXXXXX.kimsufi.com (but I can access to it in http://ksXXXXXX.kimsufi.com ). The same problem with /ftp, /pma and /webmail (not in admin., but in http://ksXXXXXX.kimsufi.com/* ).

Problem 2:
I can't send emails to others domains (I only can send emails from myname@mydomain.org to myaccounts@mydomain.org ). The webmail error: "450 4.1.2 <mail@domain.tld>: Recipient address rejected: Domain not found".

Problem 3:
My email client (Thunderbird 2.0.0.17, Ubuntu 8.04), can't connect with my mail server (*.mydomain.org) (*: I have tested with mail, pop, pop3, imap and smtp URLs).

Any idea?

Thanks,

Manuel

[joximu]

1) are there valid dns entries for "admin.ksXXX...." ?

2) postfix seems not being able to resolve the foreign domain

3) I'd say: DNS problem...

Have you read some good documentation about DNS?

/J

[spanish]

Thanks, I asked OVH (my ISP): I'm novice about DNS...