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Re: 451 server configuration error when receiving incoming e-mails from mail.gmx.de only on Postfix 1.1.11

From: Wietse Venema (wietseporcupine.org)
Date: Tue Dec 07 2004 - 11:42:30 CST

Carsten Kuckuk:
>Dear List members,
>
>I've run my Linux server with Postfix as MTA on it for well over a year
>in the same configuration (only changes to an ip whitelist so that
>important mail doesn't get blocked by RBLs) without any real problems. A
>few weeks ago I started noticing problems receiving e-mail from GMX.
>Here's what I see in my logs:
>
> >>>>>
>Dec 7 17:03:34 p15120109 postfix/smtpd[23922]: connect from
>mail.gmx.de[213.165.64.20]
>Dec 7 17:03:34 p15120109 postfix/smtpd[23922]: 87F5734C03B:
>client=mail.gmx.de[213.165.64.20]
>Dec 7 17:03:34 p15120109 postfix/smtpd[23922]: warning: unknown smtpd
>restriction: "OK"

Wietse Venema wrote:
> Please, pay attention to the above line.

Carsten Kuckuk:
> Wietse,
>
> Thank you for this pointer. My file "clientwhitelist" ends with
>
> >>>>>
> fmmailgate06.web.de OK
> mail.gmx.de OK
>
> om-verisign.rgc3.net OK
> <<<<<
>
> (notice the leading blank in the last line). Could this be enough to
> make Postfix interpret this as a continuation to the "mail.gmx.de OK"
> line and turning this into "mail.gmx.de OK om-verisign.rgc3.net" which
> would then cause the problem? Anyway, I have removed the leading blank.
>

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        Wietse
        Wietse