Many thanks all over again on your enable. The improve from the 'mail.strictly_mime' to 'accurate' appears to assistance. I resent some mails which were bounced and uptill now I did not have an error information. If this stays OK I'll mark this issue as solved. For example, Should the message http://howtofixoutlookerror800cc29617.aioblogs.com/22649886/the-smart-trick-of-how-to-fix-outlook-error-7003-that-nobody-is-discussing