How to prevent Mail creating a local Sent Messages folder I have a Gmail account in Mail.app that behaves a bit weird: whenever I send an email, Mail tells me that it created a local "Sent Messages" folder and changed my settings.

The sent email messages are correctly saved in the Sent Items on the Gmail server (this is the behavior I want), but they are also saved in this local folder. Is there a way to prevent Mail creating this local folder and save sent messages only on the server?
Select Gmail's Sent folder, then go to Mailbox &gt; Use This Mailbox For &gt; Sent.