Sendmail problem!

Hi one of my site having problem with sending mail to a AOL mail box.
If we using pop3 and smtp server in Outlook express to send mails then it goes through and received at AOL mailbox.
But if we send the mail from webmail or formmail(using send mail) It goes through but not arrive at AOL mailbox.

What can be the problem.? any ideas?

 

 

 

 

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