Can SharePoint 365 News posts be emailed to external users?

Here is a way you can get that outcome that I just tested and does work: Create a Microsoft 365 Group (one that allows guests) and adding your volunteers as members of that group by their email address. Creating a Group gives you a SharePoint site and you can create news from that site and send it via email to all the members - whether they are internal or external. They will also have access to all of the other content on the site as members of that Group. But, if you wanted to share news that is hosted on another site, like your intranet home page, that site does not actually have to have external sharing enabled - and it probably shouldn't. What you would do is use Promote on an individual article to send it to the group via email. If the article is coming from a site that the users have not been added to (as Visitors or Members - which WOULD require external sharing to be enabled if it is a communication site), they will see the email but not be able to click on any links that point to the source site - because they don't have access to the source site. If you use a "made for email" news template to create the post, they will get the full content of the page, not just a summary. There will be a link at the bottom of the page that says View in SharePoint - but this won't work for them because they are not guests on the source site. I think this approach will get you your outcome (with an initial set-up step). Just one thing - when you create the group, everyone you invite will get an email inviting them to the group. If you don't want that to happen, I think there is a PowerShell script you can run to prevent it. So, to sum up, there is not a direct way to send an email of a SharePoint page outside the company, but if you have created a group and added them as a guest member, you can send to the group and they will get the email in their "home" email account.