Hello Elyse,
Error 550 means that the SMTP server rejected your connection. What SMTP server are you using? Do you have permission to use it (meaning, is it the one your ISP or IT dept. assigned to you)? Are you saying that it did work when sending to non-juno.com email addresses?
>I tried the wwIPStuff, which seems to work, but when I try to send mail to a juno.com address I get the following error message - "550 not local host juno.com, not a gateway". What does that mean and what can I do about it?
>
Steve Gibson