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Gmail users among authors

Search among the sites authors for Gmail users and return their email addresses.

// WP_User_Query arguments
$args = array (
	'search'         => '@gmail.com',
	'search_columns' => array( 'user_email' ),
	'who'            => 'authors',
	'fields'         => array( 'user_email' ),
);

// The User Query
$user_query = new WP_User_Query( $args );