Error occurred when sending mail

I finally got this working 1 time yesterday and now I keep getting the
following error.  Would anyone know what would be causing this and some
idea on how to isolate the issue? 

Thanks

C:\Workspaces\AHLTA\3.3.5\BuildMgmt\BuildBox\Scripts>nant
-buildfile:testmail.xml
NAnt 0.85 (Build 0.85.2478.0; release; 10/14/2006)
Copyright (C) 2001-2006 Gerry Shaw
http://nant.sourceforge.net

Buildfile:
file:///C:/Workspaces/AHLTA/3.3.5/BuildMgmt/BuildBox/Scripts/testmail.xm
l
Target framework: Microsoft .NET Framework 2.0
Target(s) specified: sendmail


sendmail:

     [mail] Sending mail to [email protected].

BUILD FAILED

C:\Workspaces\AHLTA\3.3.5\BuildMgmt\BuildBox\Scripts\testmail.xml(6,6):
Error sending mail:
Error enountered while sending mail message.
Make sure that mailhost=0015-its-exmb14.us.saic.com is valid

    Error loading type library/DLL. (Exception from HRESULT: 0x80029C4A
(TYPE_E_CANTLOADLIBRARY))
        Error loading type library/DLL. (Exception from HRESULT:
0x80029C4A (TYPE_E_CANTLOADLIBRARY))

Total time: 0 seconds.

Here is the script:

MailHost address removed for security reasons.

<?xml version="1.0" encoding="utf-8"?>
<project xmlns="http://nant.sf.net/release/0.85/nant.xsd" name="Build
AHLTA" default="sendmail">

  <target name="sendmail">
    <mail
        from="[email protected]"
        tolist="[email protected]"
        subject="Build Report"
        mailhost="xxx.xxx.xxx.xxx"
        message="Build Successful"
        verbose="true"
    >
    </mail>

  </target>

</project>

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