On 09/13/2011 02:11 PM, Wietse Venema wrote: > 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 Thank-you Wietse. Thus, the problem is my broken server. Next step is to work out where the problem is.
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