'Google servers are temporarily overloaded. Your message was not sent. Please try again shortly' Resolving this sporadic error spread across the globe especially for G Suite user.
Officially there is no way to store and secure your your Google Keep notes using password protection, however, multiple online third party apps can help. You can also store in Trash can just in case.
A comprehensive guide on free Hotmail email account management for personal usage. Learn how to register, login and setup account, manage mail and mobile apps.