Sending Email to Staff

Summary

Best way to send an email (using Oracle or by means of an export)

Content

We have on occasion a need to send email to all staff with active Service Cloud accounts (regarding announcement of an OSvC feature we plan to deploy, or regarding a new protocol/procedure, or what have you), and I'm struck by what appears to be the lack of a straightforward way to do this.

A toast notification wouldn't work, because the email in question may be too long to effectively fit into that little window (we also may need to include elements such as images or charts that don't appear to be supported). Plus, it might be something we actually want staff to have in their email inboxes.