Re: SMTP-Error 451 while using smarthost for mail delivery
On Thu, 2010-04-22 at 17:28 +0000, Camaleón wrote:
> On Thu, 22 Apr 2010 16:20:01 +0200, b1 wrote:
>
> > Currently I am trying to set up a Debian Lenny Server, but I am stuck at
> > mail delivery. The server I am trying to set up, has no FQDN, so I used
> > my ISP-Mailserver as a smarthost (I enabled the proper SMTP
> > authentication in exim4).
> > This setup worked a few days, before I suddenly received 451 errors. At
> > first I thought it to be a problem with Exim4, so I switched to postfix.
> > But postfix also gives me the 451 error:
> >
> > Apr 22 15:53:31 openshoolproxy postfix/smtp[24368]: 413CF26EF9:
> > to=<webservice@b1online.de>, orig_to=<root@openshoolproxy>,
> > relay=smtp.strato.com[81.169.145.132]:25, delay=2137,
> > delays=2136/0.05/0.33/0.12, dsn=4.0.0, status=deferred (host
> > smtp.strato.com[81.169.145.132] said: 451 Local Error (in reply to end
> > of DATA command))
>
> Mmm, the remote server (81.169.145.132) has encountered some kind of
> error while sending "data" command.
>
> But, are you in control of Strato's server? If no, then you can only
> contact them and request more info about this error. If the problem is on
> their side, you can only "guess".
>
> (...)
>
> > telnet smtp.strato.de 25
> > Trying 81.169.145.133...
> > Connected to smtp.strato.de.
> > Escape character is '^]'.
> > 220 smtp.passthru
> ^^^^^^^^^^^^^
>
> (...)
>
> > 451 Local Error
>
> Look that "smtp.passthru" string, it seems some kind of proxy/redirector
> service.
>
> > Very odd. After this fail I tried the same procedure from my arch linux
> > box at home. It succeeded:
> >
> >
> >
> >
> > telnet smtp.strato.com 25
> > Trying 81.169.145.132...
> > Connected to smtp.strato.com.
> > Escape character is '^]'.
> > 220 post.strato.de [fruni mo3] ESMTP RZmta 23.0 ready; Thu, 22 Apr 2010
> > 15:55:55 +0200 (MEST)
>
> (...)
>
> > 250 queued as g0718am3MD7AJw
>
> That server response looks more "normal". No proxy between you and smtp
> server.
>
> (...)
>
> If available, try to send an e-mail using a secure channel (SSL/TLS
> 465/587 port) and check if that works. The idea behind this is to bypass
> the proxy server on their side altough I'm not sure this will work :-/
>
> Greetings,
>
> --
> Camaleón
>
>
Hey thanks camaleon
You pointed me at the right direction with your passthru hint. We had a
proxy on our net, through which the smtp-messages were going. This proxy
had a virus scanner, which caused the problem. After disabling the
scanner everything works fine.
Thank you
Benedikt
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