450 4.1.8 invalid/host-not-in-DNS

[redeye]

Can't send mail to some servers. Exim mainlog:

2006-09-20 10:15:59 1GPxFO-0006jT-IC == [email protected] R=lookuphost T=remote_smtp defer (0): SMTP error from remote mail server after MAIL FROM:<[email protected]> SIZE=4229: host mail.wxs.nl [195.121.6.51]: 450 4.1.8 invalid/host-not-in-DNS return address not allowed

domain: lxxx.nl

hostname: lxxx.nl

nslookup www.lxxx.nl
Server: 83.149.xx.xx
Address: 83.149.xx.xx#53

Name: www.lxxx.nl
Address: 83.149.xx.x

nslookup 83.149.xx.x
Server: 83.149.xx.xx
Address: 83.149.xx.xx#53

Non-authoritative answer:
x.xx.149.83.in-addr.arpa name = www.lxxx.nl.

nslookup -type=mx lxxx.nl
Server: 83.149.xx.xx
Address: 83.149.xx.xx#53

lxxx.nl mail exchanger = 10 mail.lxxx.nl.

Default DA installation (centos 4.4, exim 4.60) What's wrong, i'm stuck.

 

[redeye]

*SOLVED*

dns at parent was not configured good.