Yes. Open Custom emails in the menu and press Send email (or press Send email on a customer, a staff member or a driver). Admins can do this, and anyone an Admin gave "Send custom emails" as extra access on the Staff page. Then choose Customers, Staff or Drivers, tick the people (or all of them with an email address), and write a subject and a plain-text message. Line breaks are kept.
Each person gets their own email with your company name and logo at the top; replies go to your company email from Settings, Company. People without an email address and test addresses (such as example.com) are listed as not sent. Every email sent is listed under Custom emails with who sent it, when, the subject and each recipient.