I am not a forged sender

[Paul Douglas Franklin of Union Gospel Mission]

Well, I got Kolab up, having saved my data from the old Kolab 
installation, installed a new Kolab, and restored to the new.  I then 
went to my desktop machine to test it.  I loaded Thunderbird.  All my 
emails and folders were there.  My next test was an e-mail to myself.  
It was rejected because Kolab did not recognize me as a valid sender.
The apologetic message is below:
*****************
This is the mail system at host kolab.yugm.org.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<pdf6161 at yugm.org>: permission denied. Command output: Invalid From: header.
    Paul Douglas Franklin <pdf at yugm.org> looks like a forged sender
*************************
So I'm back on the old system.
What should be my next step?
--Paul

-- 
Paul Douglas Franklin
Computer Manager, Union Gospel Mission of Yakima, Washington
Husband of Danette
Father of Laurene, Miriam, Tycko, Timothy, Sarabeth, Marie, Dawnita, Anna Leah, Alexander, and Caleb