>I've been evaluating the wwIPStuff utilities from West Wind. Specifically, to send email via SMTP. Everything was working great during the testing phase and I had decided that we were ready to register copies for production use when we encountered a problem. Sending emails inside of our domain works, but regardless of which, any email we send to outside of our domain results in the following SMTP error
>
> 550 5.7.1 Unable to relay for "email address"
>
>Can you give me any insite as to the problem here?
Take a look at this Knowledgebase entry:
http://www.west-wind.com/wiki/kb.wiki?wc~EmailRelayingDeniedyou probably need to use authentication.
