When you send a notification to yourself, you may see ‘shopifypreview.com’ or ‘dashboard.pushowl.com’ as the preview domain instead of your store domain on your notification. This is because when you subscribed to your notifications, it was from a domain that was not your original store.
For instance, when you create a PushOwl account, you are asked to subscribe to your store notifications. In this case, you subscribe to your notifications but from dashboard.pushowl.com. Due to this, notifications you receive will use the above domain.
Similarly, if you subscribed to your store notifications from your store preview while editing your theme, it is likely that the notifications you get from your store show ‘shopifypreview.com’ as the domain.
But don’t worry. When your customers receive your notifications, they will be shown your domain.