When you send messages with Mixmax, they are sent directly through your Gmail (Google account) or Outlook (Microsoft account) and will show in your Sent mail folder. For any individual message you schedule to send later or any sequence, Mixmax will hand the message over to Gmail/Outlook to send at the time you select.
Mixmax uses the same standard SSL encryption as Gmail. We use OAuth to ensure that all of your Mixmax messages can be delivered even when your computer is off, or you've logged out of your account. This means we never store or have access to your password.