This seems to be true if no one replies to an email to the discussion list.  The sender never sees the email they sent although others do.  I know I have had this happen and when I asked about it was told there is a setting in your profile for the discussion list where you can change that.  Basically, the list software does not send to you an email that you sent it unless there is a reply unless this setting is changed.  As I recall, I found and changed that setting a long time ago but I could be wrong as it still happens to me as well..
<br><br><div><span class="gmail_quote">On 6/8/07, <b class="gmail_sendername">Mike Hoy</b> &lt;<a href="mailto:mhoy4@cox.net">mhoy4@cox.net</a>&gt; wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
this is a test, i sent an email 24 hours ago and it never showed up.<br>---------------------------------------------------<br>PLUG-discuss mailing list - <a href="mailto:PLUG-discuss@lists.plug.phoenix.az.us">PLUG-discuss@lists.plug.phoenix.az.us
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</div><br><br clear="all"><br>-- <br>Be who you are and say what you feel, because those who mind don&#39;t matter and those who matter don&#39;t mind.&nbsp;&nbsp;- Dr. Seuss