I am creating a premium theme that includes a Contact page template. Currently, I am using the wp_mail() function to send the contact email to the administrator-specified email address.
Basically, I am wondering if the wp_mail() function is the best/expected choice for implementing email functionality in a premium WordPress theme? If it is not, what would be the better option?
Yes, you should use
wp_mail(). There is no difference between a premium theme and a regular theme in this point.wp_mail()has many advantages and your clients will rely on it. If you break it, many plugins will not work anymore.Besides that, it is not the job of a theme to change this functionality. There are plugins to replace the function.