When choosing "Write new Mail" and touching "Send" immediately, two notifications are shown 1. "E-mail successfully sent" 2. "Error while trying to send email. There were problems" (Version 4:4.5~20100813.1163254-1)
I retested this today and I could not reproduce this bug. When opening a composer and clicking on 'Send', a pop up 'No recipient found - Kmail-Mobile' dialogue opens and displays the following message: 'You should specify at least one recipient for this message.' N900, 4:4.5~20100901.1170574-1maemo1.1170522
Confirmed, the described behaviour cannot be provoked anymore with fix for #247364 . Thus, resolved.
Full reference to bug that fixes this issue : http://bugs.kde.org/show_bug.cgi?id=247364 Closing.