How to recover a Mail folder from Time Machine in macOS. In the Finder, choose Enter Time Machine from the Time Machine system menu item. Go to your Home directory, then open the Library folder, then the Mail folder inside that. You may see multiple folders at the next level. You can recover the deleted Thunderbird emails in two ways either by restoring from trash or by Thunderbird backup. 1.Restore deleted thunderbird Emails from Trash folder. If in case you accidentally deleted the emails from inbox, you can follow the given steps-Run the Mozilla Thunderbird a login to your account. Browse the “Trash” option. If you are not sure how to do that, here's how to recover deleted emails on Mac using the Apple Mail app: Step 1. Click on Launchpad in your Dock and search for and click on Mail to launch the Apple Mail app on your Mac. When the Mail app launches, you will see a sidebar with your folders in. Click Continue to import the restored files into Apple Mail. Once it finishes, click Done. It is the easiest way to restore Mac Mail files. There is nothing complicated. All the Mail files can be recovered without loss. This data recovery app is easy and safe to use. Restore email account through setting preferences. Here’s a scenario.
You can delete email messages that you don’t need anymore to help keep your mailboxes manageable, and to free up storage space on your Mac or on the mail server. Deleted messages are available until they’re permanently erased.
In the Mail app on your Mac, select a message.
Click the Delete button in the Mail toolbar or move the pointer over the message’s header, then click the Delete button that appears.
Tip: To prevent the next message in the list from being automatically selected (and marked as read), press and hold the Option key when you delete the message.
If you set the “Move discarded messages” option to Trash in Viewing preferences in Mail, you can delete a message by swiping left on the trackpad with two fingers or by moving the pointer over a Mail notification, then clicking Delete (or the Trash icon).
In the Mail app on your Mac, select messages or conversations in the list.
All of the messages in a conversation will be deleted.
Click the Delete button in the Mail toolbar or press the Delete key.
If you delete a mailbox, all of the messages in the mailbox are deleted.
You can search for a set of messages to delete. For example, you can search for messages dated August 1 through September 5, 2020 by entering “date:8/01/20-9/05/20” in the Mail search field. Or, search for messages from a specific person by entering a name in the search field. Then select and delete the found messages.
Whether you can view and retrieve messages after you delete them depends on how you set options in Mail preferences.
In the Mail app on your Mac, choose Mail > Preferences, then click Accounts.
Select an account, click Mailbox Behaviors, then check the setting for the Trash Mailbox option.
If a mailbox is specified: You can view deleted messages in the Trash mailbox until they’re permanently erased. To retrieve a deleted message, drag it from the Trash mailbox to another mailbox.
If None is specified: Deleted messages are removed and aren’t available in the Trash mailbox.
In the Mail app on your Mac, do one of the following:
Choose Mailbox > Erase Deleted Items, then choose an account.
In the Mail sidebar, Control-click a Trash mailbox, then choose Erase Deleted Items.
You can set the “Erase deleted messages” option in Mail preferences to have Mail permanently erase deleted messages for you at a specified time. See Change Mailbox Behaviors preferences.
If you mistakenly delete messages, just drag them out of the Trash mailbox to another mailbox. Or select them in the Trash mailbox, then choose Message > Move to > [mailbox].
If you set up Time Machine to back up files on your Mac, you can use the backups to restore content that Mail downloaded (based on options set in Mail and on your Mac). See Restore items backed up with Time Machine.