I have been having this issue of sending out mails from my exchange 2003 for about a week now, am new to exchange thg but have been able to catch up wit the technology. I was however informed that we have in place a redirection from our ISP hosting our website such that mails that come to the web IP are forwarded to server as the server equally has a live IP address. I will appreciate if someone can help me out on this cos my users are getting on my neck.

See below for ideas of where to look. Also a good place to start is you DNS settings. Creating an SMTP Connector If the Routing Group folder is not visible in Exchange System Manager. Check that it's not still hidden at the top level. Right click Exchange Organization, properties, tick Display Routing Groups. Re-open the Exchange System Manager and navigate to the Routing Group folder. Expand the Routing Groups folderexpand your actual Routing Group, then right click on Connectors, select New, SMTP connector. Naturally you give the connector a suitable name, then Add the Local bridgehead - the dialog box will list the available servers. DNS and SMTP You cannot take DNS lightly. Start with the basics. A (Host) records map Server to IP address. The extra link that Exchange needs is - Server to email domain name. Fortunately, DNS has the MX record to perform this mapping. [MX Record] IP <--> ServerName <--> email domain. The next consideration is where to configure these MX records? It all depends on what's in the InterNic registration for your email domain. I stress email domain, because this maybe different from the name of your Active Directory domain. See more about MX Records here Outgoing email Your internal Outlook clients send all their email to your server, however some of those emails have external addresses. This outgoing email needs a DNS server with root hints.Either your DNS server has the root hints configured, if so, the email can be sent directly to its internet destination domain, or you forward all external email to your ISP's DNS server. In this second instance, the ISP takes responsibility for finding the correct server to deliver the email. Email gets delivered in your own domain without MX records, that's because your own DNS can resolve the server name in the delivery request. Whereas, internet email relies on MX records to find the mail servers. Address Space (Tab) The address Space tab is the only major difference between the SMTP and Routing Group connectors. Its purpose is to control outgoing post addressed to different email domains. The default is the * (asterisk) meaning that all email is sent to the internet using this connector. However, it is possible to filter by substituting the domain name for *. For example, computerperformance.co.uk.