Cannot believe how I missed that...
The IP configured on the mailserver, is not the one it actually has!! (on /etc/hosts)
It's 192.168.100.6 instead of 192.168.100.5 .. wich is our DNS's IP.
Sorry for the inconvenience, I overlooked that part 100 times and still missed it!!
Now the installation goes ok
Thanks x 1000! |