You can only unblock email addresses on Yahoo Mail using the desktop website — the mobile app doesn't give you the option.

You can delete all of your emails on Yahoo Mail using "Select All" repeatedly, or you can use the "Clean your Inbox" tool to ...

To switch between inboxes, tap the Profile icon in the upper-right corner and choose an email address. Another option is to install the provider's app. Outlook and Yahoo have their own apps. This ...