Blacklisted by an IP address that does not belong to me

I got an email from one of my clients stating they cannot receive an email to a certain person.  Here is the message the recipient receives.

This email is being returned to you because the remote server would not or could not accept the message. The registeredsite servers are just reporting to you what happened and are not the source of the problem.

The address which was undeliverable is in the section labeled:
  "----- The following addresses had permanent fatal errors -----".

The reason your mail is being returned to you is in the section labeled:
  "----- Transcript of Session Follows -----".

This section describes the specific reason your e-mail could not be delivered.

Please direct further questions regarding this message to your e-mail administrator.

--Registeredsite Postmaster

   ----- Transcript of session follows ----- ... while talking to
smtp1.msp.securence.com.:
>>> RCPT To:<greg@domain.com>
<<< 550 Unable to add greg@domain.com because host 209.17.115.109 is listed on bl.spamcop.net
550 5.1.1 <greg@domain.com>... User unknown
>>> DATA
<<< 554 no valid recipients, bye
451 4.4.1 reply: read error from smtp1.msp.securence.com.


My Spam filter uses the IP's 216.17.3.48 and 204.11.209.99.
The Exchange server is using 50.251.186.***

I cannot figure out how they claim that his email address is going to 209.17.115.109.

Is this something on the senders end or my end?
Computer HelperWindows Server AdminAsked:
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Patrick BogersDatacenter platform engineer LindowsCommented:
Hi

If the sender is unable to send mail to one of your clients it means the sending mailserver has an issue with the blacklist.

In other words, if your servers werent configured correctly and ended on a blacklist you would not be able to send mail to the entire world.

Does this infosniper link rings any bells for you ?
http://www.infosniper.net/index.php?ip_address=209.17.115.109&map_source=1&overview_map=1&lang=1&map_type=1&zoom_level=7
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Computer HelperWindows Server AdminAuthor Commented:
Turns out that I was misinformed. It was the other company that is trying to email my client. Therefore my client cannot receive their email because they have been blacklisted.
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arnoldCommented:
The message is that they can not add the recipient because the host 209.17.115.109 presumably the source of the mailing is blacklisted.

The problem/difficulty is that you are presumably the admin of the "domain.com" domain is asked to address the cause of securence.com mail server rejected a sender from 209.17.115.109 from relying through their system.
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Patrick BogersDatacenter platform engineer LindowsCommented:
Yes that is a correct assumption.
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Computer HelperWindows Server AdminAuthor Commented:
Since that IP is blacklisted shouldn't I tell them to fix that first?
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arnoldCommented:
Presumably those who tried to send the message, received the NDR with the error you were provided.

This blacklist is auto-clearing after enough time has passed.
The IP is no longer listed.
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