Rolf,
thanx for the reply. As mentioned i'm a newbe but i think the answer is somewhere in the Core Module as you've written but i still can't figure it out. I'll try to explain my problem a bit better:
MY ISP hosts my domain called markladage.nl
Mercury is configured as follows (parts of the Mercury.ini):
[General]
myname: markladage.nl # Canonical name for this server
[Domains]
markladage: markladage
markladage: markladage.nl
Problem: a mail send to test@markladage.nl (test is a non existing local user) is not collected by Mercury and Mercury won't reply to the sender and/or the postmaster that this user don't exist
I guess the problem is that the local server is named markladage.nl and the domain hosted by my ISP is named markladage.nl ???
Mark