When you log into Spark on a new device with your email for sync, the app syncs all your email accounts and preferences (swipes, signature, templates, etc.). The email for sync is the email address you used to log into Spark for the first time. Learn more about the sync option in Spark.
The account you logged into becomes your email for sync. Now, you can add other email accounts to Spark and adjust your preferences. Spark will sync them when you sign into this account on a new device.
Note:You can use different emails for sync on different devices. For example, you can log into your work email on your office computer while using your personal email to sync preferences across your own devices.