[ExchangeList] Spam confirmation needed

I've got users getting the following kickbacks in their email and could use a confirmation of whether it's associated with SPAM and possibly a way to resolve it. Here's what appears as the subject in these emails:
 
X-Mlf-Threat: nothreat
X-Mlf-Threat-Detailed: nothreat;none;none;list_addrbk_domain
X-Mlf-UniqueId: i200703211546250213841

Any responses appreciated.

Other related posts: