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Windows Exchange 2003 Email Error - The Following Recipient(s) Could Not Be Reached

This past week we suddenly started receiving email errors. I Googled it and read two different articles, the most helpful one being the EE one, https://www.experts-exchange.com/questions/20960015/Could-not-deliver-the-message-in-the-time-limit-specified.html. However, I thought I'd open a new one since a) this EE one is 6 years old and b) the suggestions given mess with Exchange and the Server and my partner and I are novices there. Thank you.

The most common error happened to two different employees to more than one recipient:

Your message did not reach some or all of the intended recipients.

Subject: RE: DRK ENTERTAINMENT
Sent: 08/24/10 11:49 AM

The following recipient(s) could not be reached:

'xxxxxxx@feldherrlaw.com' on 08/26/10 12:08 PM
Could not deliver the message in the time limit specified. Please retry or contact your administrator.
<mail.unitedpropertiescorp.com #4.4.7>

Another email error read:

The following recipient(s) cannot be reached:

xxxxxxxx@att.com on 8/25/2010 4:36 PM
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<mail.unitedpropertiescorp.com #5.5.0 smtp;550 Invalid recipient <xxxxxxx@att.com> (#5.1.1)>

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Shabarinath TR

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rvfowler2

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Went with the last suggestion first, http://www.mxtoolbox.com. However, when I clicked on "check blacklist," I came up with the following, but I'm not even sure if the IP address is ours. The below is all Greek to me.

Testresult for 64.115.0.127:

This IP IS CURRENTLY LISTED in our Database.
Please note that this listing does not mean you are a spammer, it means your mailsystem is either poorly configured or it is using abusive techniques.
If you don't know what BACKSCATTER or Sender Callouts are, click the links above to get clue how to stop that kind of abuse.

To track down what happened investigate your smtplogs near 31.07.2010 08:53 CEST +/-1 minute.

You will either find that your system tried to send bounces or autoresponders to claimed but in reality faked senders, or your system tried sender verify callouts against our members near that time.

So you should look for outgoing emails that have a NULL SENDER or POSTMASTER in MAIL FROM and which got rejected at remote systems.

Read the rejection texts carefully and it shouldn't be a big deal to figure out what caused or renewed your listing.

History:30.06.2010 08:23 CEST listed

A total of 23 Impacts were detected during this listing. Last was 31.07.2010 08:53 CEST +/- 1 minute.
Earliest date this IP can expire is 28.08.2010 08:53 CEST.

rvfowler2

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Sorry that this slipped by; I thought I had closed it. Turns out that the problems were on the recipient ends, but all of these suggestions were helpful or will be in the future.