about relaymailfrom.patch

[tengteng]

Hi:all
        I use Chris Johnson's patch "relaymailfrom.patch",but it is seemed not to 
work!i 
create a file under /var/qmail/control/ and named relaymailfrom,in this file 
there is only a entry "@mydomain.com",but another domain user such as 
(@test.com) can still send mail use my smtpserver,I don't know why!?where 
should  i put relaymailfrom? 
  Could you give some advice? 
  I am very thank you for your any advice.thanks 

best regards