You can use the checkbox feature (at the far left of each email message) to make changes to multiple messages at the same time.
You can either click on the checkbox at the top left of the Communications tool (next to the "Inbox" title) to select all messages on the page, or you can click on one or more checkboxes next to the email messages to make the same change to select items.
For example, you can click on the checkboxes for one or more items to:
Manage Emails in Batches