2. In the Menu bar go to Mail > Preferences > Signatures

3. Choose the G Suite account and click on the "+" button

4. Name the signature and click in the blank field.
Please make sure to uncheck the box "Always match my default message font".

Leave the Mail.app opened and start a new window in your browser.
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5. Open CHROME and go to https://www.signaturesatori.com/app/user

(Please use Google Chrome, copy/paste in Safari doesn't work correctly for Mail.app.)

Fill or update information for your signature.
​(Your administrator sets what information you can edit)

6. When you are finished, click on the button Signature preview.
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7. In this modal window carefully select the whole signature and copy it with CMD+C

8. Go back to  Mail.app > click the empty field and paste the copied signature with CMD+V.

Images are not shown due to a Mail.app bug. But don't worry, it should display just fine when it will be used in an email.

9. Select your new signatures from a dropdown of Choose Signature section.

10. Close the window with the settings.

Your signature is ready!
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Did something go wrong? Make sure you didn't miss these important steps:

1. The signature must be added as a part of Google account.

2. Make sure to leave the box "Always match my default message font" unchecked.

3. Always use Chrome to open your User page.