Filr 3.x Outlook Plugin
A potential issues exists when replying to emails in Outlook when the Filr Outlook Plugin has been installed. You may see a message, The email with the subject "<subject of the email>" could not be sent. This email is saved in the drafts.
The issue has been addressed in the Filr 3.4.2 update, which is available via the Online update mechanism.
A defect in the Filr Outlook Plugin.