Apple Mail group address

Once you get their emails entered into contacts, the other stuff you want to do is a cinch. and you can create overlapping lists and smart lists from the same contacts.

You can add email address to contacts with just a click:

In the message list, select a message, then choose Message > Add Sender to Contacts.

from:

Use information found in Mail in other apps on Mac - Apple Support

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I have two comments to offer. When using the Mail app, you may or may not know that you can save any email contacts and they are saved toContacts. Second, for what it's worth, I stopped using Mail years ago (and Contacts). I see a lot of problems with it reported here on the forum. I have used and have been very satisfied with using Thunderbird for my emails. It is very stable, creates groups and has features most other apps do not have. It's also free. I suggest giving it a trial run.

did you try selecting multiple contacts in the sidebar, then choosing "create group" as described in this article:

Create and change groups in Contacts on Mac - Apple Support

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Apple Mail's contacts are stored in Apple's Contacts app. That is where you can create groups. Easy to do. Just follow the instructions in the Help section.