Mac Mail / Smart mailbox / sender is member of group

Hello KMelvin77,

To help resolve this issue, make sure you've followed the steps in this article create your smart mailbox:

Use Smart Mailboxes in Mail on Mac - Apple Support

Create Smart Mailboxes

1. In the Mail app  on your Mac, choose Mailbox > New Smart Mailbox.

2. Enter a name for the Smart Mailbox.

For example, if you create a Smart Mailbox to organize emails from your soccer group that include an attachment, you could call it Soccer schedules.

3. Specify the criteria. 

• Set the first condition: Click the first pop-up menu, choose an option (such as From, Subject, or Sender is member of group), then complete the condition using the other menus or fields that are shown (they vary depending on your choice in the first pop-up menu). 

For example, if you chose From, you can choose “contains” or “begins with” in the second pop-up menu, then enter a sender’s name in the text field. If you chose “Sender is member of group” in the first pop-up menu, you can choose a group name in the second pop-up menu.

• Add or remove conditions: To set additional conditions, click the Add button . To remove a condition, click its Remove button . 

• Set the scope of multiple conditions: If you have at least two conditions, a pop-up menu appears that lets you choose whether an email must meet any or all of the conditions to be included in the Smart Mailbox.

• Include messages from the Trash or Sent mailbox: Select the checkbox to include emails that are in those mailboxes in your Smart Mailbox.

4. Click OK.

Whenever you select your Smart Mailbox in the sidebar, emails that match its criteria are listed.

You can also create a Smart Mailbox by copying and editing an existing one. In the Mail sidebar, select the existing Smart Mailbox, choose Mailbox > Duplicate Smart Mailbox, then edit the duplicate.

Best Regards.