Exchange 2010 SP1 transport error

Hi,

Using Exchange 2010 SP1.

I get a lot of these errors.

Please guide.
Thanks

Log Name:      Application
Source:        MSExchangeTransport
Date:          2/1/2011 9:16:56 AM
Event ID:      8010
Task Category: RemoteDelivery
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      exh1.domain.com
Description:
A message with the Internal Message ID 1088 was rejected by the remote server.  This message will be deferred and retried because it was marked for retry if rejected.  Other messages may also have encountered this error.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="MSExchangeTransport" />
    <EventID Qualifiers="49156">8010</EventID>
    <Level>2</Level>
    <Task>7</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2011-02-01T15:16:56.000000000Z" />
    <EventRecordID>99387</EventRecordID>
    <Channel>Application</Channel>
    <Computer>exh1.domain.com</Computer>
    <Security />
  </System>
  <EventData>
    <Data>1088</Data>
  </EventData>
</Event>