MYSQL QUERY ERROR

Query: SELECT s.*, su.url FROM engio_sites s LEFT JOIN engio_sites_urls su ON su.site_id = s.id WHERE s.vdir = ""mailto:skm-chel@skm-mebel.ru"
Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'mailto:skm-chel@skm-mebel.ru"' at line 7