Microsoft 365 from GoDaddy 說明

Clear my outbox

The outbox is a folder in your email client where messages stay when they’re scheduled to send but haven’t yet. They might be scheduled to send at a specific date and time, or because the client is unable to send from the address at this point.

Deleting messages from your outbox will prevent them from sending, such as if there are unwanted or unintentionally scheduled messages.

  1. Go to your outbox folder.
  2. Select any messages you don't want sent.
  3. Delete those messages.

More info