Hi,
You can manually add parameters to the inserted tags to change the way the result is displayed, for example {subtag:name|ucfirst}
ucfirst : Uppercase the first character
Example: "joHn" becomes "John"
upper : Uppercase the information
Example: "joHn@Doe.com" becomes "JOHN@DOE.COM"
lower : Inserts the information in lowercase
Example: "joHn@Doe.com" becomes "john@doe.com"
ucwords : Uppercase the first character of every word
Example: "joHn doe" becomes "John Doe"
You'll find more info here: https://www.acyba.com/acymailing/75-acymailing-plugin-tagsubscriber.html