I recently received an email from app-notification@spiceworks.com
Our XWall filter captured this:
Reason: Spam SLS/RBL
The message was received from a host that is on a spam list.
Additional info:
The sending host is: mtaout-165-pao.sendlabs.com [216.146.32.165] The SLS service is: dnsbl.sorbs.net
I checked @spiceworks.com the hostname scoming up are mx1.emailsrvr.com and mx2.emailsrvr.com where is 216.146.32.165 or mtaout-165-pao.sendlabs.com coming from?