SendAsAnotherAccountInGmail
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See How To Use Google's SMTP Server - DigitalOcean

Turn off "use as alias".

Don't forget to specify the SMTP server as smtp.gmail.com, not something silly like smtp@gmail.com or whatever.

Your username is your full gmail address, yourname@gmail.com, and the password is an app password you create.

Create an app password for yourself under Google | Manage Account | Security | Account passwords, and use the app password.