[cobalt-users] Qube2 - e-mail problem between domains+subdomains

["Tom Kroos" <tkroos@xxxxxxx>]

Hi all,

I have a problem with our Qubes. We have several installed in different
offices. All mail is received/sent through our ISP. The Qubes pick up/send
the mail destined for their particular (sub)domain. Domain-names are like
xyz.nl (main office), sub1.xyz.nl, sub2.xyz.nl etc.

Mail can be sent from the subdomains to the main domain. However mail
originating from the main domain cannot be sent to any of the subdomains,
and bounces back with the following error:

550 user@xxxxxxxxxxxxxx Host unknown (Name server: sub1.xyz.nl: host not
found)

Any ideas how we can tackle this problem as both our ISP and us have run out
of ideas.

TIA

Tom Kroos
Rotterdam, Netherlands