Have a look at your SMTP-(out) logs<br><br><div class="gmail_quote">On 7 May 2011 13:11, boniface njoroge <span dir="ltr">&lt;<a href="mailto:bonifacenjoroge5@gmail.com">bonifacenjoroge5@gmail.com</a>&gt;</span> wrote:<br>

<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Hi guys we are usin mdaemon as the mail server and since the past two<br>
days when sendind mail to public accounts like yahoo the below mail<br>
appears.Any clue on what can be wrong.<br>
--------------------------------------------------------------------------<br>
MDaemon Delivery Status Notification - <a href="http://www.altn.com/dsn/" target="_blank">http://www.altn.com/dsn/</a><br>
--------------------------------------------------------------------------<br>
<br>
The attached message had PERMANENT fatal delivery errors.<br>
<br>
After one or more unsuccessful delivery attempts the attached message<br>
has been removed from the MDaemon mail queue on this server.  The<br>
number and frequency of delivery attempts are determined by local<br>
configuration.<br>
<br>
--------------------------------------------------------------------------<br>
YOUR MESSAGE WAS NOT DELIVERED TO ONE OR MORE RECIPIENTS<br>
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</blockquote></div><br>