The spam messages share two similarities, Zink, who discovered the botnet, explained in a blog post <http://blogs.msdn.com/b/tzink/archive/2012/07/03/spam-from-an-android-b otnet.aspx> . First, each message closes with the signature "Sent from Yahoo! Mail on Android." Secondly, they all share a message ID that reads: Message-ID: <1341147286.19774.androidmob...@web140302.mail.bf1.yahoo.com> Is there a preferred way to look for the message header? This way, these can be scored high enough to delete. We're seeing large amounts of these the last week. Thanks John Dobbin Pen Publishing Interactive - http://www.penpublishing.com <http://www.penpublishing.com> --- This E-mail came from the Declude.JunkMail mailing list. To unsubscribe, just send an E-mail to imail...@declude.com, and type "unsubscribe Declude.JunkMail". The archives can be found at http://www.mail-archive.com.