When my hosted clients email anyone using Embarq, they're getting the following bounced message: This also applies to anyone that has their account emails forwarded to their regular Embarq address; they're not getting any emails, but my mail log shows this same error message. I've emailed Embarq, and they can't find any reason for it on their end. The IP isn't found on any blacklists, MxToolbox comes up clean, and the Senderbase.org reputation is "Good". A search for this error message on Google comes up virtually empty. Have any of you guys encountered this error with Embarq? Any suggestions?