To select multiple emails for deletion, tap on the ‘More’ Menu at the top right (three dots) > ‘Select Emails’ > tap the emails you want to select. But there’s an even easier way! Canary’s Bulk Cleaner feature allows you to quickly select and remove multiple emails automatically!
To use the Cleaner tool :
1) Tap on Home > More.
2) Choose ‘Auto Select Unimportant’
3) Scroll down so that emails are automatically identified and selected. More emails are selected as you scroll further. You can then select an action and it is applied to all selected emails.