If youre not prompted, or you just want to add another account, follow these steps.

If youre not sure what information to enter, please contact your email provider for help.

If you added more than one account, you can click the disclosure triangle next to Inbox in the sidebar, then select a mailbox to see only the messages for that account.

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Youll lose all the offline copies of your mail if you do this, but itll still be stored on your email server if you use a modern email service.

But, on a MacBook with 128 GB of solid-state drive space, this can be a significant waste of space.

Locate the Mail folder, right-click or Control-click it, and select Get Info.

Youll see how much space is being used by the Mail app for your user account.

CleanMyMac 3 has a tool that will look through your email and find the large attachments and assuming you are using IMAP (which is the default), it will leave the attachments on the server and only delete the local copy.

And its not a bad idea to have backups of your most important stuff before deleting anything.

This makes them accessible entirely offline and allow Spotlight to index them for easy search.

However, if you have gigabytes of emails in your Gmail account or elsewhere, you may not want them all on your Mac.

This option was removed in OS X Mavericks, so theres no longer any way to tell Mail to download less messages from within Mail itself.

Open the Mail app, click the Mail menu, and select Preferences.

Click the Accounts icon and select the account you want to change settings for.

Click the Advanced tab and uncheck the Automatically download all attachments option.

Attachments wont be automatically downloaded, but will be stored online until you use them thatll save some space.

For example, Gmail offers a setting that can hide emails from the Mail app and other email client that access it over IMAP.

This will prevent the Mail app from seeing and downloading all your mail.

You could then delete mails from your Mail app and theyd be deleted on your computer, but not on your email server.

Mail App Archive Solely On

POP3 really isnt ideal for a modern email system, but this would give you email notifications with Mail and allow you to send messages from it while leaving your archive solely on your email server.

Then you can delete those gigabytes of locally cached data and Mail wont try to download any more emails.

Instead of the Mail app, you can use your email services web-baesd interface Gmail on the web for Gmail users, for example.

You could also look for a third-party email client on the Mac App Store or elsewhere.

Other email clients should offer an option to store less emails offline and limit the size of our cache to a manageable size.

Uncheck the Mail option for accounts you no longer want to use Mail with.

Right-click or Control-click the folder with the name of your email account and select Move to Trash.

Mail App Free Up All

You can then empty your trash to free up all those gigabytes.

Free Mail App For Mac