1 — Make sure you have 2FA enabled
For this method to work, you need to have two factor authentification enabled for your Google account. If it’s not, follow the link below and set it up.Enable 2FA for your Google account

Create an app password to send mail as Gmail SMTP

2 — Create an App Password
Google will verify your ownership with this app password. Select “Mail” under app, and “Mac” under device. Hit “Generate”. Copy and keep for later!Create an app password

3 — Add your email to Gmail
Go to Gmail -> Settings -> Accounts and Import. Then, select “Add another email address you own” under Aliases.

4 — Fill in your sender’s information
Set your forwarded email (your alias) and your sender’s name. Untick “treat as an alias”.

5 — Fill in your email informations
SMTP is smtp.gmail.com, port is right already.
Username is your gmail address (incl. @gmail.com)
Password is the password you generated on Step 2.
Leave TLS enabled as is

6 — Confirm ownership
You will receive an email from GMail asking you to confirm ownership with a code. Fill in the code in the popup modal, and you are all set!

7 — Send emails from your alias
Now you can just select your alias in the list when you compose a new message.

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