The messages are meant to be viewed only by the owner of the account because it requires logging in to the Yahoo account.
Besides blocking Yahoo emails, Clean Email allows you to apply any other action to new emails coming to your mailbox without any manual work.
Archive Manipulator has been successfully tested on Yahoo! This information may change as Yahoo revises these Communications Services by adding or removing features or using different service providers.
You can add contacts, change your online status and save and search messages.