Whenever I try to send a Read Reciept to a requestor, I get an error message as follows:
'The message could not be sent because it rejected you as the sender. Server Response:
'500 Mail from address not nalid (<>)'. (Account:'POP3.acs-htp.com', SMTP Server:'SMTP.
acs-htp.com', Error Number: 0x800ccc78).

Are my settings messed up? All other emails are sent and received without error.