
And there is no setting to change that time-limit. Now you have more control over your eMail. The only place where Gmail will auto-delete messages in 30-days is from Trash and Spam. Another perk is that it will not effect any of the other folders’ settings when you do it this way. If you haven't exited Thunderbird you can try using 'Ctrl+Z' to undo a action (repeat as needed).
So if you accidentally delete a message you can recover it from the Trash folder if it hasn't been emptied. This is great to be able to do with the Trash folder (I always seem to forget to empty it). The deleted message is also typically copied to the Trash folder. After you are done with your selection just click on the OK button The Inbox was the one I did not want deleting after a time, but for the Trash, I would prefer to have it empty after 30 or 60 days. You can even choose to have your trash empty after a certain amount of time. You can check the box Use my account settings, which will just keep the settings you already setup for the entire account. Change it to the desired settings you wish this folder to follow. You will notice in this window the same thing you saw from Step 4 from above.

Right-click on the deleted email and click on Move To option from the Menu. Open the Trash folder and search for the email that you want to regain. Step 3: Once in here, select the tab on top that says Retention Policy. Open Mozilla Thunderbird and log in your account. I will choose Trash which we will right-click on. Step 2: Choose the folder you wish to change the settings for. Go to Settings, click on Server Settings, then select Advanced. Thunderbird will re-upload all the messages automatically to the IMAP server.Step 1: Is the same as the first step from above. Thunderbird In the Folder pane, look for IMAP mail and do a right-click.

Shut down Thunderbird, and navigate to /Profile/fault/Mail/hostname_of_your_server/.Create a POP3 account with the same credentials as the IMAP one, but make sure this account is unable to connect - don't enter your password.When it prompts, select to replace the target file. If the name of your backup profile folder is the same as your current profile, just copy the backup profile and paste it to the location of the existing profile. I was unable to coerce Thunderbird to restore those emails onto the IMAP server directly, so I went with another approach: Restore Thunderbird Profile to the Original Location.

I had a similar problem - through some quirk a bunch of emails disappeared from my IMAP server, but remained in the INBOX and Sent files on the local drive.
