Swiss development team, Mailplane GmbH today announces Mailplane 4.0, the important update to their app that allows macOS users to easily manage their Gmail, Calendar, Contacts and Google Inbox accounts without cluttering their browser. Version 4.0 brings the ability to include annotations and shapes in emails, notifications with actions, allows users to search for messages across all of their accounts and quickly navigate a label, tab, account, or bookmark. 8 new extensions are also available.