WordPress at a glance
filter is not described

wp_mail_content_type filter-hook . WP 2.3.0

Filters the wp_mail() content type.

Usage

add_filter( 'wp_mail_content_type', 'filter_function_name_181' );
function filter_function_name_181( $content_type ){
	// filter...

	return $content_type;
}
$content_type(string)
Default wp_mail() content type.

Changelog

Since 2.3.0 Introduced.

Where the hook is called

wp_mail()
wp_mail_content_type
wp_staticize_emoji_for_email()
wp_mail_content_type
wp-includes/pluggable.php 431
$content_type = apply_filters( 'wp_mail_content_type', $content_type );
wp-includes/formatting.php 5724
$content_type = apply_filters( 'wp_mail_content_type', $content_type );

Where the hook is used (in WP core)

Usage not found!