Hey htk2,
We’d love to help you out! Sounds like you want to send an email to someone you don’t know well and want to keep your email address private.
To do so, you’d want to create a new Hide My Email address in the System Settings or System Preferences in macOS, in the Mail app, or on iCloud.com
For more info, check out these steps:
Send an email using a unique, random address
When you write a new email message, Hide My Email allows you to create a unique, random address directly in the Mail app.
1. In the Mail app on your Mac, click the New Message button to compose a new message.
2. Add a recipient and subject for your message.
3. Messages you send from a unique, random address can only be delivered to a single recipient.
4. Move the pointer over the From field.
5. Click the pop-up menu that appears, then choose Hide My Email.
* If you’ve never sent this recipient an email from a unique, random address: A new address appears in the From field.
* If you previously sent this recipient an email from a unique, random address: The address used previously with this recipient appears in the From field.
6. Write your message, then when you’re ready, click the Send button .
This is all outlined here: Use Hide My Email in Mail on Mac - Apple Support
For any other questions or concerns, contact Apple for further support on this here: Get Support
We hope this helps out.
Take care!