How to Automatically Delete Old Messages From Gmailby Ryan Menezes
Gmail offers more than 7GB of storage per account, enough that you're very unlikely to run out of space. Rather than delete messages, you can archive them, removing them from the inbox but keeping them in the account. Nonetheless, it's still possible to delete mail if you like, and you can use Gmail's powerful custom filters to automate this process.
Log in to your Gmail account.
Click the gear icon in the screen's upper-right corner.
Click "Settings" from the pop-up menu to load the Settings page.
Click "Filters" from the row of options beside the Compose button to open the Filter pane.
Type "before:2011/01/15" in the box labeled "Has the words."
Replace "2011/01/15" with the cutoff point before which you want to delete all messages.
Click "Create filter with this search" to open a new pane of options.
Check the box labeled "Delete it."
Check the box labeled "Also apply filter to [...] matching conversations."
Click "Create filter." All the old messages will move to your Trash box.
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