Allow me to chime in and share what requires you to send emails in QuickBooks Desktop for Mac, bpike.

Meeting the system requirements is important in terms of sending emails. And, this process requires Apple Mail, Microsoft Outlook 2016 or later, including Mac Office 365.

To connect your email to QuickBooks, here are the steps:

1. Go to QuickBooks, then select Preferences.
2. Select the Email icon.
3. From Send Emails Using, select Custom.
4. A list of Email Accounts appears. If you haven't added any email accounts to QuickBooks, this list will be empty.
5. Select the + icon to add a new account.
6. Add an account name, then add the settings from your email provider.
7. Repeat for any other accounts you want to add.
   
   

You’ll find the email address listed in the From field of your message and you can choose any account to send from.

I'm adding this article to help review the set up: Email sales forms in QuickBooks Desktop.

Let me know if you need anything else with setting up an email. I'm always right here to help you.