[Exim] MX record problem

Hi,

I am a newbe to exim4 and am using it as a MTA. But everytime I try and send an email externally, I get the following mesage:

all relevant MX records point to non-existent hosts

Can anyone help?

Robert MacPhail
Enterprise IM/IT Architect / Planner
(819) 956-1249 | télécopieur/facsimile (819) 956-8621 |
robert.macphail@???/robert.macphail@???
Travaux publics et Services gouvernementaux Canada | 11, rue Laurier, Gatineau (QC) K1A 0S5
Public Works and Government Services Canada | 11 Laurier Street, Gatineau, QC K1A 0S5
Gouvernement du Canada | Government of Canada