The Spently app already automatically adds UTM tags to each of your email notifications. These UTMs can be used to track performance in your Google Analytics, and they are also used to display Marketing Events in your Shopify Admin. Since these marketing events rely on these specific UTMs, they can not be edited or changed.
Here is a list of all the UTMs we append to links in your emails:
order confirmation= UTMCampaign=Spently Order Confirmation Email&UTMMedium=notification_email&UTMSource=spently
order cancelled= UTMCampaign=Spently Order Cancelled Email&UTMMedium=notification_email&UTMSource=spently
refund= UTMCampaign=Spently Refund Email&UTMMedium=notification_email&UTMSource=spently
draft order= UTMCampaign=Spently Draft Order Email&UTMMedium=notification_email&UTMSource=spently
abandoned checkout= UTMCampaign=Spently Abandoned Checkout Email&UTMMedium=notification_email&UTMSource=spently
POS receipt= UTMCampaign=Spently POS Email&UTMMedium=notification_email&UTMSource=spently
shipping confirmation= UTMCampaign=Spently Shipping Confirmation Email&UTMMedium=notification_email&UTMSource=spently
shipping update= UTMCampaign=Spently Shipping Update
Email&UTMMedium=notification_email&UTMSource=spently
shipment out for delivery= UTMCampaign=Spently Shipment Out for Delivery Email&UTMMedium=notification_email&UTMSource=spently
shipment delivered= UTMCampaign=Spently Shipment Delivered Email&UTMMedium=notification_email&UTMSource=spently
account invite= UTMCampaign=Spently Customer Account Invite Email&UTMMedium=notification_email&UTMSource=spently
customer welcome= UTMCampaign=Spently Customer Account Welcome Email&UTMMedium=notification_email&UTMSource=spently
follow up emails= UTMCampaign=Spently Follow Up Campaign&UTMMedium=followup_email&UTMSource=spently