WordPress at a glance
filter is not described

wp_mail_charset filter-hook . WP 2.3.0

Filters the default wp_mail() charset.

Usage

add_filter( 'wp_mail_charset', 'filter_function_name_5560' );
function filter_function_name_5560( $charset ){
	// filter...

	return $charset;
}
$charset(string)
Default email charset.

Where the hook is called

wp_mail()
wp-includes/pluggable.php 448
$phpmailer->CharSet = apply_filters( 'wp_mail_charset', $charset );

Where the hook is used (in WP core)

Does not used.