[CentOS] how to configure the mail server to put the code before sending the mail

Tue Dec 2 18:03:14 UTC 2008
ann kok <oiyankok at yahoo.ca>

Hi All
 
How to configure the mail server to put the code before sending out the mail?
 
eg: When I send out the mail to yahoo to some receiver's address, it needs me to put the number and letter as same as the box before sending out the mail
 
Thank you


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