<div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="Ih2E3d"><br>
> | I've been looking at a selection I've been sent through this<br>
> morning and | there doesn't seem to be anything consistent about them<br>
> and there not | hitting many spamassasin rules.<br>
><br>
> I considere them hostile spam senders and blacklist them accordingly.<br>
<br>
</div>I agree totally. I bounce any mail from a known 'challenge response'<br>
user. The entire concept of 'challenge response' is flawed and a huge<br>
waste of time and bandwidth.<br>
<font color="#888888"><br>
<br>
--</font></blockquote></div><br>What has everyone been doing to stop these?<br>