create ftp access using some domain

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http://www.linuxforums.org – i've single server that have 3 virtual host : mail.xx.com, xx.com, 'n ftp.xx.com with the same ip i can access my 3 domain with browser using ftp with the same result, my question.... how to disable ftp acces to: mail.xx.com 'n xx.com, so just ftp.xx.com that can access by user (HowTos)