SMTP Mail routing problem with particular email address

HI,

We have a problem routing one particular address's mail.  I explain: we have a Web application using a WebQuerySave agent to send a confirmation to the external user.  We manage the email address in ne names.nsf.  It work fine for all user except one.  The only one who have a domain name containing .qc.ca extension.

Is there a known issue? Is there something we may look at to fix the problem?

Thanks!

Richard