Marking emails as read or unread Unread E-Mails are marked with the Unread icon . The following options exist: mark single emails as read or unread mark all emails of an email folder as read How to mark an email as unread or read: Select one or several emails. Click the More actions icon in the toolbar or in the detail view. Select Mark as unread or Mark as read. Or: For single emails, click the Mark as unread icon or the Mark as unread icon . Use the context menu in the email list. Tip: To mark all emails in a folder as read, click on All above the list. Select Mark all emails as read.