Sanitizing wp_mail input

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Hello,
if I want to use wp_mail() function (replaced by your plugin) how much of sanitization of the data that I’m inputting do I need to do?
I’m planning to make REST Api endpoint which will receive email data from frontend (written in react) and then use wp_mail() to send an email.

How much work will I need to do by myself to make it secure and spam proof?

Thanks for answers,
Dominik