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Email being rejected

Can someone help with why these emails from hotmail and yahoo are being rejected? i am using asl 4.019

here is the message:

This message was created automatically by the SMTP relay on
mail.lexingtonfirst.org.
  
A message that you sent could not be delivered to all of its recipients.
The following address(es) failed:

  brian@rightler.com
    SMTP error from remote mailer after RCPT TO::
    host 66.152.97.34 [66.152.97.34]: 554 :
    Sender address rejected: Access denied 


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