You are most likely not sending each message twice but saving two copies of it in your Sent folder. Uncheck Store sent messages on the server under Mailbox Behaviors.
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To troubleshoot this issue please make sure you dont select the option keeping a copy of sent items in Outlook for Mac Accounts select your Gmail account Advanced Folders like below picture.
Why is my mac sending duplicate emails. Also to confirm whether this issue is related to Outlook client or your account please try to send a test email in your web mail. In my previous experience with this type of issue it is usually caused by an alias email address being used along with the original email address. In this case if you are using the Mail app.
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