No local delivery??? HELP!

[Erwin van Kroonenburg]

Hi,

I've just upgraded qmail from 0.94 to 1.03 and now there's no local 
delivery of email!
When I sent email from anywhere on the internet to our mailhost it 
immediately delivers.
When I sent email from inside our LAN to an account on the mailhost the 
message is put in the queue and as far as I can see it isn't deliverd!

What to do?

Regards,

Erwin