SMTP Error Message - What exactly does it mean?

Some people trying to send me mail, receive this message:

##########################################################

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

  klaus@fleischer.it
    SMTP error from remote mail server after RCPT TO:<klaus@fleischer.it>:
    host mx1.netim.net [91.121.137.63]: 554 5.7.1 <klaus@fleischer.it>:
    Relay access denied



##########################################################

And from another address:


##########################################################
> Hi. This is the qmail-send program at mail.gmx.net.
> I'm afraid I wasn't able to deliver your message to the following
> addresses.
> This is a permanent error; I've given up. Sorry it didn't work out.
>
> <klaus@fleischer.it>:
> 91.121.137.63_does_not_like_recipient./Remote_host_said:_554_5.7.1_<klaus@fleischer.it>:_Relay_access_denied/Giving_up_on_91.121.137.63./
>
> --- Below this line is a copy of the message.

##########################################################

Can you tell me, what exactly this means?
Who can resolve this issue?
The hosting provider of the sender or my hosting provider (netim)?

My provider says, this is a problem on the other side, which they can't do anything about.

TIA
proofficeAsked:
Who is Participating?
 
lamaslanyConnect With a Mentor Commented:
It *could* be that the freemail providers are part of a netim black-list of providers that try and send spam.  Does netim operate with a black-list?  Is it static-manual, static-automatic or dynamic?  (static is a big list of providers that are black-listed; dynamic automatically black-lists providers based on real-time analysis of traffic - if a provider is flooding netim's mail servers it may automatically black-list them for a period of time)
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lamaslanyCommented:
It seems that the mailserver mx1.netim.net is rejecting email to klaus@fleischer.it and I would guess that the problem lies with netim.  From the message it looks like mx1.netim.net  doesn't know that it should be accepting email for the fleischer.it domain.

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lamaslanyCommented:
Using:  http://www.mxtoolbox.com/

ns5.securenetim.net reports the following MX records for 'fleischer.it':
 
Preference Host Name IP Address TTL    
10 mx1.netim.net 91.121.137.63 10800  
20 mx2.netim.net 91.121.106.172 10800
 

SMTP Diagnostics for mx1.netim.net

RESULT: mx1.netim.net
Banner: 220 mx1.netim.net ESMTP Postfix
Connect Time: 0 seconds - Good
Transaction Time: 0.531 seconds - Good
Relay Check: OK - This server is not an open relay.
Rev DNS Check: OK - 91.121.137.63 resolves to mx1.netim.net
GeoCode Info: Geocoding server is unavailable
Session Transcript: HELO please-read-policy.mxtoolbox.com
250 mx1.netim.n [125 ms]
MAIL FROM: <test@mxtoolbox.com>
250 2.1.0 [141 ms]
RCPT TO: <test@mxtoolbox.com>
554 5.7.1 <test@mxtoolbox.com>: Relay access deni [141 ms]
QUIT
221 2.0.0 B [125 ms]
 
The mailserver looks to be working okay...
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proofficeAuthor Commented:
So it looks like mx1.netim.net isn't configured properly, right?
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lamaslanyCommented:
Have netim confirmed that their mail servers are configured to accept email for the fleischer.it domain?
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lamaslanyCommented:
Does netim host your mailbox or are you simply forwarding email sent to @fleischer.it to another email address?
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proofficeAuthor Commented:
Yes, they are hosting that domain and forwarding every mail to another address.
Normally it works.
It looks like only certain senders encountered that problem.
Mainly from freemail-providers.
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proofficeAuthor Commented:
Thanks!
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