Logging out removes your email accounts and downloaded mail from this device only. Your email accounts stay in your Newton account and come back when you sign in again.
Steps
Desktop
Click your profile picture in the top-right corner.
Click Log Out.
In Sign out?, click Sign Out.
You can also press ⌘K on Mac, or Ctrl+K on Windows and Linux, and choose Sign out.
iPhone, iPad & Android
Open the menu and tap the Settings gear at the bottom.
Tap Log out.
Tap Log Out to confirm.
Good to know
Logging out doesn't affect your other devices, and it doesn't stop Newton's access to your mailboxes. To do that, remove the email account instead.
Emails you scheduled with Send later still go out.
Next time you sign in on this device, Newton downloads your mail again.
To sign out of account.newtonhq.com, click your profile picture there and choose Sign out.