WordPress at a glance
action is not described

phpmailer_init action-hook . WP 2.2.0

Fires after PHPMailer is initialized.

Usage

add_action( 'phpmailer_init', 'action_function_name_6533' );
function action_function_name_6533( $phpmailer ){
	// action...
}
$phpmailer(PHPMailer)
The PHPMailer instance (passed by reference).

Changelog

Since 2.2.0 Introduced.

Where the hook is called

wp_mail()
phpmailer_init
wp-includes/pluggable.php 494
do_action_ref_array( 'phpmailer_init', array( &$phpmailer ) );

Where in WP core the hook is used WordPress

wp-includes/pluggable.php 103
add_action( 'phpmailer_init', 'fix_phpmailer_messageid' );