All advert emails i get from Comodo have this
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Comodo Security Solutions, Inc. (e-mail@comodogroup.com)
High risk This message may be dangerous.
It has something to do with Sender ID http://by137w.bay137.mail.live.com/mail/HelpPane.aspx?project=MailClassic&market=en-GB&querytype=keyword&query=gnihsihp&tmt=&domain=live.com&format=b1