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Apple Mail doesn't let you manage distribution lists natively. You either have to go through the Contacts app, or use an external newsletter service. ListMailer fixes this. It's a native Mail extension that lives in your compose toolbar. Create mailing lists, add recipients from CSV or directly from the To/CC/BCC fields of any email, and send to your groups with one click. No app-switching, no web logins.
ListMailer
ListMailerSend group emails directly from Apple Mail