Adding an alias to your Gmail allows you to write emails from your alias and still benefit from your Signitic signature.
❶Go to your Gmail settings

To get started, go to your general settings and click on See all settings.
❷Add an e-mail address

Then, in the Accounts tab, click on Add another email address.

You will be able to enter your alias in the e-mail field and leave the box marked Treat as an alias.
You now have the possibility to write from your alias!
👉🏻 The signature of your alias will be available tomorrow.

In a new message, you can change the sender's e-mail or choose another signature (pencil icon at bottom right).