Can't email to the outside world

 I am having trouble emailing outside of our company.   I found some
previous
 postings on this list which seemed to express the same problem, but
 I couldn't quite find an answer.    Emailing within the company works
great;
 with an email address outside the company, I get an error from the MS
 exchange server on our network that the 'recipient is unknown'.   The email
 leaves the AS400 successfully.   What am I missing?

 Following are settings:
 Host name  . . . . . . . . . . .   'COL400'
 Domain name  . . . . . . . . . .   'Colonialgroupinc.com'
 Domain search list . . . . . . .   *DFT
 Host name search priority  . . .   *REMOTE
 Domain name server:
 Internet address . . . . . . .   '205.152.0.8'
                                          '205.152.16.8'
                                          '205.152.32.8'


  CHGSMTPA - Mail Router 'SAVNT4'

  Work with TCP/IP Host Table Entries             System:   COL400

          Internet           Host
  Opt  Address          Name

       127.0.0.1         LOOPBACK
                               LOCALHOST

      172.17.1.4        SAVNT4
      172.17.1.5        COL400
                               COL400.Colonialgroupinc.com
      192.40.210.1    AS400

 EMAIL from the network system administrator:
 Your message did not reach some or all of the intended recipients.

       Subject: TEST
       Sent: 8/2/02 9:30 AM

  The following recipient(s) could not be reached:
        donnabryant@peeksoft.com on 8/2/02 1:25 PM
              The recipient name is not recognized
 The MTS-ID of the original message is: c=us;a= ;p=enmark
 stations,;l=SAVNT40208021724PPNVX8F2
             MSEXCH:IMS:Enmark Stations, Inc.:ENMARK:SAVNT4 0 (000C05A6)
 Unknown Recipient

- Donna Bryant
Colonial Industries Group, Inc.