Email addresses that forward to your primary email are known as aliases. There are a variety of ways that you can create Gmail and Workspace (formerly G Suite) aliases. Gmail users: Create Gmail email aliases using the plus and dot notation Google Workspace: Create Gmail email aliases without admin permissions Google Workspace: Create Gmail email […]

By saying treat as an alias you’re telling Google that it’s your own address. The consequences of this choice are only minor.

1. If you’ve told Google it is your address, then if you put this address as a “To” (or Cc, Bcc) address, Gmail will simply place a copy directly into your inbox.
2. If you’ve told Google it isn’t your address (ie, it’s not an alias), then if you put this address as a “To” (or Cc, Bcc) address, Gmail will still send the email as outgoing mail, treating it no differently to any other address.

All email messages you have sent will be labeled with the Gmail Sent label. However, it is important to understand that the Gmail Sent label is not an actual label