@ThunderBlade if you’d like to send the message from the user’s email, then using user device’s email client will be the most feasible way to achieve this.
You can use “mailto:” URL scheme to open the mail client app. See here: Special Links: Email, Text (SMS), and Phone | Adalo Resources. Also have a look here https://stackoverflow.com/questions/4782068/can-i-set-subject-content-of-email-using-mailto how to set subject and content.
Best,
Victor