I managed to sort it out:
If you've got Norton this may be the problem. Check this link.
http://www.windowskb.com/Uwe/Forum.a...800CCC79-error
"Giuseppe" wrote:
> I've exactly the same problem too. Any solution?
>
> "Khanh Vo" wrote:
>
> >
> > I hope you get a solution to your problem because I have the exact same
> > problem.
> >
> > "Marc Miller" wrote:
> >
> > > Windows XP Professional SP2, Outlook 2003 SP2 connected to Exchange 2003 SP2
> > >
> > > I can send a new email to an address but get the following message when
> > > replying. No attachments and it was occuring only occasionally but now on
> > > all.
> > > The following recipient(s) could not be reached:
> > >
> > > 'target email address' on 5/2/2006 1:02 PM
> > > 550 not local host aol.com, not a gateway
> > >
> > > Thanks for any help.
> > >
> > > Marc Miller
> > >
> > >
> > >