Okay, I got myself a problem I need some serious help with.

I run various mail servers that run RedHat Linux, and a variety of MTA's
(Postfix, Sendmail namely) and some have Mailman on them.  They all work
wonderfully.  However where I work we have an Exchange 5.5 server for our
mail, and I've got a problem getting Mailman/Sendmail to work with it.

Every time I send an email to a test list (for example,
[EMAIL PROTECTED]), the Exchange server replies saying "Unknown
User" or "Unknown Receipient".  Now I have no clue what is causing this,
aside from the explaination I've been given:

Exchange Server 5.5 strips the "hostname' from the email address:
[EMAIL PROTECTED] becomes [EMAIL PROTECTED]

The Listbox is running RedHat 8.0, Sendmail, and MailMan 2.0.13

The full error when I try to send from my corporate account is (I have
blanked out our listserv's domain for security reasons):

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

      Subject:  test
      Sent:     4/4/2003 2:23 PM

The following recipient(s) could not be reached:

      '[EMAIL PROTECTED]" on 4/4/2003 2:23 PM
            The recipient name is not recognized
        The MTS-ID of the original message is: c=us;a= ;p=city of st.
jose;l=STJOSEPHMAIL0304042023210THHRM
            MSEXCH:IMS:City of St. Joseph:CITY:STJOSEPHMAIL 0 (000C05A6)
Unknown Recipient

If anyone can help out, it'd be appreciated.  I've NEVER had these problems
with Mailman in the past, and I'm of the opinion it's Exchange.

Thanks in advance...

---
Joe Brouhard, MCP, A+
Computer Support Technician
City of St Joseph
[EMAIL PROTECTED]
http://www.ci.st-joseph.mo.us

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