Today I learned that InfinityFree's free hosting plan does not support the PHP mail() function, so an external email service is required to send email from an InfinityFree free plan website.
As a result, I ended up spending a lot of time in setting up a contact form for my upcoming Cassette Beasts fanlisting by using PHPMailer, based on a contact form page built with PHPMailer that is provided by InfinityFree. since I am new to PHP.