Outgoing email fails when sent to external domain accounts. We have a sub office that just requires pop email accounts. No other SBS services. They also need to use our email domain name. The sub office mail is received on the ISP’s mail server. When users at head office working on the SBS server send mail to the sub office, the mail doesn’t leave the SBS LAN. All other outgoing and incoming mail works through the SBS Exchange server to other domains, except in the case if the outgoing emails domain name is ours and the account is only on the ISP’s server. Example. User Fred@ourdomaim.com at head office LAN, sends mail to Tom@ourdomain.com at sub office. Fred gets this error. #550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ## How its setup now. The domain name Mx record points to our ISP’s mail server. The SBS pop3 connector downloads the mail from this server. Internal Exchange LAN mail sends out on the SBS configured Smart Host of our ISP. How can I get the Exchange server to send mail to an account outside our LAN?

Hi, Please try the change the type of 'ourdomain.com' to Internal Relay Domain: 1. Open Exchange Management Console, expand Organization Configuration->Hub Transport. 2. On Accepted Domain, change the type of 'ourdomain.com' to Internal Replay Domain. Then test to see if the issue persists.

Just to make Gen Lin's suggestion clearer. All too common issue in the SBS world. How to Configure Non-Authoritative Accepted Domains in SBS 2008 (Exchange 2007) http://blogs.technet.com/b/sbs/archive/2008/09/25/how-to-configure-non-authoritative-accepted-domains-in-sbs-2008-exchange-2007.aspx MCTS: Messaging | MCSE: S+M | Small Business Specialist