ok, I have found at least a part of the problem.
Everything runs fine as long as I am sending mail inside our domain.
But if a receipient is outside the domain (of our exchange server), than I am receiving exceptions like descripted in the first post above.
I have seen an existing thread "Email notifications not working" and a new "How to configure BugNet to semd mail notification to other mail domain", so I will stop posting here and add further informations to the other posts
Everything runs fine as long as I am sending mail inside our domain.
But if a receipient is outside the domain (of our exchange server), than I am receiving exceptions like descripted in the first post above.
I have seen an existing thread "Email notifications not working" and a new "How to configure BugNet to semd mail notification to other mail domain", so I will stop posting here and add further informations to the other posts