Gmail automatically comes with Primary, Social, and Promotions tabs already displayed, but you can choose to remove or add different tabs.
Add a custom signature, with image presumably, to every email you send.
You could send out emails using a different ‘From’ address, the one other than your current Gmail account.
Once you’ve composed your email, click the clock icon at the bottom right-hand corner of the message, and then set an expiry date.
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