I've installed the windows server 2003 pop3 service on my server to have some basic send/receive email facility on a couple of domains.
I'm using encrypted password authentication (not local or AD) because I need the same username on different domains.
Followed the wizard and as far as I can see all is set up to correspond to numerous sites on google showing how to configure it.
However, when using Outlook, I can connect to the server and receive email, I can send email to the box from an external email address, but when I try to send using the email on the server I get an authentication error.
In short I can send email to, read email from, but not send email USING the email account.
Is there anything obvious that comes to mind that I may have missed?