> Hi all
> 
> I am using mapi session and mapi messages to send emails from an 
> application.
> 
> On one machine the mapisession.signon() gives an error saying that login 
> is unsuccessful. The error probably points to their machine being 
> incorrectly configured but how do I trap this ?
> 
> Thanks 
> 
> Regards
> Graham
Did you ever figure out this problem?  I have the same issue, when I log 
into a mchine with a certain USER_ID from our Network, my process fails at 
the exact same line mapisession.signon ().  Any ideas or pointers would be 
great.