I´ll try to explain what happens, for so far I can trace it. In exchange we have user with email : user@domain.* When I send an email to user@domain.* which is in exchange there is no problem When I send an email to a user@differentdomain.* there is no problem When I send an email to user@domain.* which is not in exchange te mail is bounced by the server ---------------------------------------------------------------------------------- Your message did not reach some or all of the intended recipients. Subject: test Sent: 26-4-2006 13:42 The following recipient(s) could not be reached: user@domain.* on 26-4-2006 13:41 The e-mail account does not exist at the organization this message was sent to. Check the e-mail address, or contact the recipient directly to find out the correct address. <domain.* #5.1.1> ------------------------------------------------------------------------------------ In my opionion the server is looking for the user@domain.* because some users with the same domain are in the exchange. So how can I send an email to a user which is not registered in the exchange but uses the same domain for the email. (The mail not collected by batch-smtp)