Simon Loewenthal/NL/Tele2:
>
> Hi,
>
> I have a seen a few of these messages popping up in the mail.log
> over the past weeks. Would someone tell me whether this is a
> configuration problem with my server, or a remote site? The 451 error
> has appeared from a couple of sites, hence I wonder if the problem lies
> with my site. In the case of the example below, the message is delivered.
SMTP is a client-server protocol.
When sending mail, Postfix is the SMTP client.
When receiving mail, Postfix is the SMTP server.
When the SMTP server replies with "server configuration error" then
the SMTP server has a problem.
Wietse
