Send via Outlook for Web, Outlook desktop apps, or another email client like emClient, and turn on the read receipt option in the message compose window. Note: the email account you are sending from generally cannot be a free-tier email address (like a standard gmail or outlook account), but rather must be a paid / professional / institutional one (e.g., Google Workspace, Microsoft 365’s non-free tier, etc.).
Best $7 a month one can spend, IMO.