Comment 8 for bug 361993

I have another useful information.

I could sent to a user in my exchange organisation (the one that was failing before) when NOT using his primary SMTP-address.

I used one of its 2 other smtp adresses (in this case <email address hidden>) and it worked.

So it looks like this might have something to do with searching in the global addressbook before sending?

I also tried with this users 3rd smtp address and it worked fine,too.

So what we now now is, that the problem can be limited to the primary smtp address of the user. I also tried "LastName, Firstname" which does not work either.
I think it has to to something with the global address book.