pre_wp_mail filter-hook . WP 5.7.0

Filters whether to preempt sending an email.

Returning a non-null value will short-circuit wp_mail(), returning that value instead. A boolean return value should be used to indicate whether the email was successfully sent.

Usage

add_filter( 'pre_wp_mail', 'filter_function_name_8127', 10, 2 );
function filter_function_name_8127( $return, $atts ){
	// filter...

	return $return;
}

$return(null|true|false)

Short-circuit return value.

$atts(array)

Array of the wp_mail() arguments.

• to(string|string[])
  Array or comma-separated list of email addresses to send message.

• subject(string)
  Email subject.

• message(string)
  Message contents.

• headers(string|string[])
  Additional headers.

• attachments(string|string[])
  Paths to files to attach.

Changelog

Where the hook is called

$pre_wp_mail = apply_filters( 'pre_wp_mail', null, $atts );

Where in WP core the hook is used WordPress