Hi, We are having exchange 2007. We can not send email to some of the domains using exchange acounts, how ever the same mails can be sent via pop3 account. I stuck with this issue & have no idea what might me the possible causes for the issue. can someone help me? Thnaks in advance

Hi, You could try and setup a smarthost on your Exchange server since it seems your are having problems with either dns lookup or has been blacklistet. If you paste in the error you are getting we can get closed to a valid solution. Here is a article about setting up af smarthost. Go down to the point where it says "Send connector configuration" /MartinExchange is a passion not just a collaboration software.