[Kroupware] Problems sending mail with Kolab.

[Tore Felix Munck]

Hi!

I have installed Kolab with Debian binaries. Everything seems to be ok, 
except from Sending Mail. 

I have create a user "tore" on the kolab server, with mail-domain lin123.ath.cx.

Trying to send an mail to username at myisp.com from Outlook, 
with the kolab server as default smtp server with authentication,
gives the following message in /kolab/var/postfix/log/postfix.log:

Aug 07 10:31:52 lin123 <info> postfix/smtpd[22345]: connect from 213-145-166-58.dd.nl.com[213.145.166.58]
Aug 07 10:31:53 lin123 <info> postfix/smtpd[22345]: TLS connection established from 213-145-166-58.dd.nl.com[213.145.166.58]: TLSv1 with cipher RC4-MD5
(128/128 bits)
Aug 07 10:31:53 lin123 <info> postfix/smtpd[22345]: 2F645142D9: client=213-145-166-58.dd.nl.com[213.145.166.58]
Aug 07 10:31:53 lin123 <warning> postfix/smtpd[22345]: warning: the "check_relay_domains" restriction is going away; use "reject_unauth_destination" instead
Aug 07 10:31:53 lin123 <info> postfix/smtpd[22345]: 2F645142D9: reject: RCPT from 213-145-166-58.dd.nextgentel.com[213.145.166.58]: 554 <username at myisp.com>:
Recipient address rejected: Relay access denied; from=<tore at lin123.ath.cx> to=<username at myisp.com> proto=ESMTP helo=<iikts1042>
Aug 07 10:31:57 lin123 <info> postfix/smtpd[22345]: disconnect from 213-145-166-58.dd.nl.com[213.145.166.58]

Any hints?
Thanks.

Tore