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Deliverability Letter

URL Parameter

Also known as: Tracking Parameter, Query Strings

URL parameters are the text that comes after the "?" in a link. They tag where a click came from and what someone does on your site so you can see how each email link performs.

URL parameters are small tags you add to the end of a link in your emails. They sit after a question mark and use simple name and value pairs like utm_source=email. When someone clicks, these tags travel with them to your site. Your analytics tool reads them and records where that visitor started.

This detail helps you see which emails, subject lines, and buttons actually drive results. You can tell if a welcome series beats a weekly newsletter or if a sale campaign brings in more orders than a product update. You also see how different segments behave once they land on your site. Instead of guessing, you get clear numbers tied to each send.

A simple way to start is to use the same set of UTM parameters for every email. Keep names short and consistent, like utm_source=email, utm_medium=newsletter, and a clear campaign name such as black-friday-2024. Use one extra tag to tell links apart so you know which button or placement works best. Once this is in place, you can compare performance over time without cleaning up messy data.