I got the error message to go away by going to Edit > Preferences > Mail Accounts > [ select my default mail account ] > 'Edit' button > 'Defaults' tab
and then setting a folder (ex. 'On This Computer' > Sent), clicking OK, and then re-doing the same thing, but un-setting the folder the second time around (by holding down the ctrl key and clicking the selected folder to un-select it) and then hitting OK again. After this, in the 'Defaults' tab it should say "Sent Messages Folder: <click here to select a folder>" -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to evolution in Ubuntu. https://bugs.launchpad.net/bugs/850106 Title: Fails to append sent mail to mbox in post-processing Status in The Evolution Mail & Calendaring Tool: New Status in “evolution” package in Ubuntu: Confirmed Bug description: Whenever I send an email from Evolution 3.1.91 using Ubuntu 11.10, I get this error message: The reported error was "Failed to append to mbox:///home/[redacted]/.local/share/evolution/mail/local#Sent: Invalid folder URI 'mbox:///home/[redacted]/.local/share/evolution/mail/local#Sent' Appending to local 'Sent' folder instead.". Package version is: Evolution 3.1.91-0ubuntu1 To manage notifications about this bug go to: https://bugs.launchpad.net/evolution/+bug/850106/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp