Bounced Mail Notice-But Mail Is Posted on List???

[Leonard Chatagnier]

I've got this bounce notice on the last two list postings using Thunderbird:

This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed.

        ubuntu at thelubedoctor.net

The source is: postmaster at iSS-Out

Subject: [Bulk] Delivery Status Notification (Failure)


Reporting-MTA: dns;iSS-Out
Received-From-MTA: dns;iSS-Out
Arrival-Date: Tue, 4 Sep 2007 03:20:45 -0400

Final-Recipient: rfc822;ubuntu at thelubedoctor.net
Action: failed
Status: 5.7.1
Diagnostic-Code: smtp;550 5.7.1 Unable to relay for ubuntu at thelubedoctor.net

Followed by my reply which I saw on the archive URI.

Anyone know what's going on?  Anyone using Thunderbird have this problem?
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