Exim rejecting e-mail

[bsasninja]

A person is sending a mail to one of my customers and the mail is refused, I checked exim_mainlog and appear this:

rejected after DATA: syntax error in 'Reply-To:' header when scanning for sender: missing or malformed local part (expected word or "<") in ""Please do not respond":;"


This person also sent the email to a hotmail address my customer has, and he got it with out problem.

So why is refusing my mail server the message and why hotmail accept it without problem?

Is there a way to jump exim acl for a especific address??

Thanks