Postbox 5.0.6 adds sharing functionality for some of the most commonly used apps on macOS.
Download and install the Postbox Sharing Add-on.
Navigate to macOS System Preferences / Extensions / All. On the right, ensure that Postbox Sharing Extension is selected as illustrated below:
If the Sharing Extension does not appear, then please make sure you are running at least version 1.0.1 of the add-on.
Examples of Sharing Functionality
Safari - Postbox will embed the URL of the page within the body of a new message. The page content will not be embedded within the message itself.
Address Book - The .vcf card will be attached to a new message.
Pages, Numbers, and Keynote - Attaches the document to a new message.
Maps - Adds a link to the address within the message body.
Preview - Attaches the image to a new message.
Photos - Attaches up to 10 selected images to a new message.
Finder - Attaches up to 10 selected files to a new message.
If you have Postbox configured to display the Profile Manager at start, and if you share content when Postbox is not running, then the share action will be ignored.
Calendar - If you right-click an event in Calendar, then select "Mail Event," please note that this follows a different code path from Sharing, and this is not supported.
iTunes, Maps, Notes - Not currently supported.