How to Send an Email via WordPress | Article on Sending emails on WordPress -- http://bordoni.me/wordpress/send-wordpress-email/

wp_mail.headers.php

<?php
$to = "[email protected]";
$subject = "Learning how to send an Email in WordPress";
$content = "WordPress knowledge";
$headers = [
	'Reply-To' => "Gustavo Bordoni <[email protected]>"
];

$status = wp_mail( $to, $subject, $content, $headers );

wp_mail.html.php

<?php
$to = "[email protected]";
$subject = "Learning how to send an Email in WordPress";
$content = "WordPress <b>knowledge<b>";
$set_content_type_callback = static function () {
	return 'text/html';
};

add_filter( 'wp_mail_content_type', $set_content_type_callback );

$status = wp_mail( $to, $subject, $content );

// Reset content-type to avoid conflicts -- http://core.trac.wordpress.org/ticket/23578
remove_filter( 'wp_mail_content_type', $set_content_type_callback );

wp_mail.multiple.php

<?php
$to = [
	"Gustavo Bordoni <[email protected]>",
	"WordPress Developer <[email protected]>",
	"[email protected]"
];
$subject = "Learning how to send an Email in WordPress";
$content = "WordPress knowledge";

$status = wp_mail( $to, $subject, $content );

wp_mail.simple.php

<?php
$to = "[email protected]";
$subject = "Learning how to send an Email in WordPress";
$content = "WordPress knowledge";

$status = wp_mail( $to, $subject, $content );

Helpful info.. Thanks