We have multiple Active Directory sites with Exchange 2007 servers in each site. We have a problem where a user in site A is trying to send a message to a user in site B but the message is ending up in the e-mail queue at site 3. The queue viewer on the Exchange server in site three describes it as "smtp relay to remote active directory site." How do we configure e-mails to correctly go from site A to site b without issue? Also, how do we get teh queued messages delivered? More info: this is only an issue for sending from site A to site B. Also, some message from site A do get delivers to site be but it is random. Also, messages from site B are delivered without issue and any site sending or receiving mail to or from the Internet (i.e. other e-mail domains) are delivery without issue. Any ideas?