smtp mail send on php?

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PHP

i am this url code use

http://www.9lessons.info/2009/10/send-mail-using-smtp-and-php.html[^]


this code successfully executed. but body characters max 720 characters received to the mail. to continue to 721 and more than characters entered send on this mail but not received this message on mail. what is the problem this code. please help me now.