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how to add a verify before sending mail

PostPosted: 1:08pm, Mon 07 Oct, 2013
by jackery
hello guys,i want to add a verify before sending mail, such as ,i only want to send the subscribers where there mails like @hotmail.com ,how should i do ? where to add my function to the code? or how to do it ?.
i came from asia ,english is poor,so hope you can Understand me :(