email – Gmail – Display warning when replying on forwarded messages


I have two mails:

  • main@example.org
  • secondary@example.org

I’ve set it up so secondary mails are being forwarded to main@example.org, so I only need to check one mail. But I often (by accident) reply from my main@example.org, since I just press ‘reply’ and type away. My plan is to collect all my mails in my main@example.org, – and then log onto secondary@example.org and reply from there (keeping those two seperate).

How do I get a warning, when I reply to an email that have been forwarded from another mail? In the style as this:

gmail warning - does not belong to your organization

I have Google Suite and I use Gmail.