Hello Everyone, I am having trouble enabling my users to send email to addresses outside of the domain, when they are not on our LAN. What relay settings can I adjust to allow people who successfully authenticate to send mail to everyone, not just people in our domain? I havent been able to do this without opening my relay for every spammer in the world to use Thanks for the help! Chris

what version of Exchange are you using?

Exchange Server 2003 with SP2. . .

On the SMTP Virtual Server. Access Tab, Relay button check the "Allow All computers which .... to relay" also confirm that authentication is allowed on the SMTP virtual server. Its under Authentication button. check anonymoys otherwise you cannot receive mail from internet also check basic and/or windowdsintegrated. if your clients support windowsintegrated, then you can skip basic auth. Basic Auth send username and password in clear text. A better solution is to use outlook 2003 and outlook RPC over HTPP/S then users would gain more benefith of Exchange server.

Hi there, First of all, the default settings on SMTP Virtual Directory when Exchange Back End is installed is to allow all authenticated users to send emails internally and externally. now, in your case, you want your SMTP Server to handle sending emails for non-authenticated users, right ? from outside your network, from home or from remote location , is this is right ? or are they physically connected to your LAN , but they are not logged on to your domain ? now for first case , when the users are remotely want to send emails using your internal SMTP Server, you have to make sure that your SMTP Server is accessible from outside, which you need to secure such design or implementation. you can put an SMTP gateway in your DMZ area , if you have, and allow remote users to send emails through out this SMTP Gateway. or as the last reply from MVP guy, you can enable RPC over HTTPS which will make your life easy, but you need to read more about how to enable or implement this as per Microsoft Best Practices, here is the link for Microsoft Documentation for the same: Exchange Server 2003 RPC over HTTP Deployment Scenarios http://technet.microsoft.com/en-us/library/aa998950.aspx one last thing, if your users are using Outlook Express to send emails from outisde and they are using your internal SMTP to send emails (assuming that your internal SMTP can be reached from outside) then you need to provide a user name and password inside your account settings in Outlook Express, this is a must for SMTP authentication for Exchange Server 2003 with SP2. i hope that the above information was useful somehow to answer your qeustion. please let me know if they were helpful to you. Regards Alaa Al-Ankar Blog: http://aalankar.blogspot.com

Thanks for the replies! I actually was able to get the relay working properly, it seems I didn't have windows authentication checked under access control.