Emails not being delivered - Meesage (Could not deliver the message in the time limit specified)

Hi..

Since I installed a new Exchange server a few users are complaining that their emails are not being delivered and are receiving a message similarto the one below.

Your message did not reach some or all of the intended recipients.
      Subject:  test message
      Sent:     17/06/2008 17:27
The following recipient(s) cannot be reached:
      Colin Smith (csmith@leonardgray.co.uk) on 19/06/2008 17:27
            Could not deliver the message in the time limit specified.  Please retry or contact your administrator.
            <mail_server_1.wisemanlee.co.uk #4.4.7>

Also what does the following mean..

The MX records for leonardgray.co.uk are:
"      10           athena.hosts.co.uk
"      10           hermes.hosts.co.uk

Ian PriceIT ManagerAsked:
Who is Participating?
 
coolsport00Connect With a Mentor Commented:
Is your DNS (external) set up correctly? Verify your reverse DNS by going to DNS Stuff and run a report.

Also, see here: http://support.microsoft.com/kb/284204/en-us

Regards.
~coolsport00
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Ian PriceIT ManagerAuthor Commented:
Coolport00

Could you explain in more detail ?
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