traying to send email out of my intranet using exchange 2007 by IMAP im geting this :
Your message did not reach some or all of the intended recipients.
Sent: 11/20/2007 6:02 PM
The following recipient(s) could not be reached:
'firstname.lastname@example.org' on 11/20/2007 6:02 PM
550 5.7.1 Recipient not authorized, your IP has been found on a block list
Any idea to trace the problem its wellcome
thanks in advance