I have the same problem.
And with me, allowing all relaying does NOT help. We cannot send mail, whatever the system config.
PLEASE HELP...
> Date: Mon, 16 May 2005 21:04:04 -0500
> Subject: Can't send email to outside email addresses
>
> I recently upgraded my Post.Office server from 3.6.3 v 103 to 3.6.3 v
> 105. Before the upgrade, everything was working fine. However, after the
> upgrade nobody within my company can send emails outside of the network.
> We can still receive all emails just fine. We can also send emails
> within our company. The problem lies in trying to send emails to anyone
> at a different domain. Anytime we try we get a 550 error stating that
> relaying to that particular email address is forbidden.
>
> Originally, our relaying settings restricted all relaying except from
> our internal IP address range. We also had POP before SMTP turned on.
> Now, the only way we can send emails outside of our domain is to allow
> all relaying. Has anyone else experienced something like this? If so,
> what was the solution?
>
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