Will cutom value work in email links

If I want to setup an utm link within an email
can I use custom values to the utms?
like utm_source=%firstname%

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A UTM parameter is a customizable tag that is added to a destination URL. Unsure what you are trying to achieve here, but utm_source would equal the source in which the recipient would receive the communication.

This does work. But then make sure to untick the “Google Analytics tracking” checkbox. Otherwise AC will add another set of utm tags to each URL automatically. Also, it’s advised not to send any personal info (like %FIRSTNAME% in your example) in URLs as they can be intercepted.