Querying Email Addresses for a List of Users with Same Last Name?

Hi @Holidaymaine:

Here’s the query you are looking for:

<?php

include( '../wp-load.php' );

$sql =<<<SQL
SELECT DISTINCT
  u.user_email AS user_email,
  um.meta_value AS user_lastname
FROM
  {$wpdb->users} AS u
  LEFT JOIN {$wpdb->usermeta} AS um ON u.ID = um.user_id
  LEFT JOIN {$wpdb->posts} AS p ON u.ID = p.post_author
  LEFT JOIN {$wpdb->term_relationships} AS tr ON p.ID = tr.object_id
  LEFT JOIN {$wpdb->term_taxonomy} AS tt ON tr.term_taxonomy_id = tt.term_taxonomy_id
  LEFT JOIN {$wpdb->terms} AS t ON tt.term_id = t.term_id
WHERE 1=1
  AND u.user_status="0"
  AND um.meta_key = 'last_name'
  AND um.meta_value="%s"
  AND t.slug = '%s'
SQL;
  $sql = $wpdb->prepare( $sql, 'Smith', 'baseball' );
  $usersemails = $wpdb->get_results( $sql );
  header( 'Content-type:text/plain' );
  print_r( $usersemails );