custom-wp-mail.php

<?php

function nws_email_template($message, $subject) {
	// Email Template
	$template_file = get_stylesheet_directory() . '/emails/default.php';
	// Render Template
	ob_start();
	include_once( $template_file );
	$nws_template = ob_get_contents();
	ob_end_clean();
	// Replace Placeholder
	$message = str_replace('%%MAILCONTENT%%', $message, $nws_template);
	$to_replace = array(
		'%%BLOG_URL%%'         => get_option( 'siteurl' ),
		'%%HOME_URL%%'         => get_option( 'home' ),
		'%%BLOG_NAME%%'        => get_option( 'blogname' ),
		'%%BLOG_DESCRIPTION%%' => get_option( 'blogdescription' ),
		'%%ADMIN_EMAIL%%'      => get_option( 'admin_email' ),
		'%%DATE%%'             => date_i18n( get_option( 'date_format' ) ),
		'%%TIME%%'             => date_i18n( get_option( 'time_format' ) ),
		'%%NWS%%'              => $subject
	);
	foreach ($to_replace as $placeholder => $var ) {
		if(is_array($var) ) {
			do {
				$var = reset($var);
			} while(is_array($var));
		}
		$message = str_replace($placeholder, $var, $message);
	}
	// Return Template with data
	return $message;
}

add_filter( 'wp_mail_content_type', 'set_content_type' );
function set_content_type($type) {
	if( $type != 'text/html' ) {
		// If not html, work with content and filter it
		add_filter( 'nws_filter_email', 'wp_kses_post', 50 );
		nws_content_filters();
	}
	return $content_type = 'text/html';
}
remove_filter('wp_mail_content_type', 'wp_mail_content_type');

add_filter( 'wp_mail', 'my_wp_mail_filter' );
function my_wp_mail_filter( $args ) {
	// Remove [Neo Wedding Solution] to subject on email
	$subject = preg_replace( '`\[[^\]]*\]`', '', $args['subject'] );
	$args['message'] = nws_email_template(apply_filters('nws_filter_email', $args['message']), $subject);
	return $args;
}

function nws_content_filters() {
	add_filter( 'nws_filter_email', 'wptexturize' );
	add_filter( 'nws_filter_email', 'convert_chars' );
	add_filter( 'nws_filter_email', 'wpautop' );
	add_filter( 'nws_filter_email', 'clean_retrieve_password' );
}

function clean_retrieve_password($message) {
	return make_clickable( preg_replace( '@<(http[^> ]+)>@', '$1', $message ) );
}

add_filter( 'wp_mail_from_name', 'custom_wp_mail_from_name' );
function custom_wp_mail_from_name( $original_email_from ) {
	return 'My Site Name';
}

add_filter( 'wp_mail_from', 'custom_wp_mail_from' );
function custom_wp_mail_from( $original_email_address ) {
	//Make sure the email is from the same domain 
	//as your website to avoid being marked as spam.
  //Just example email
	return 'myemail@example.com';
}