MSN/Hotmail evaluates SenderID Framework (SIDF) records as part of its reputation assessment process in order to determine whether to accept a message, route it to the junk folder, or reject it.  See the knowledge base entry on What is SenderID? for additional information about SIDF.  Because messages that utilize the Content Rendering feature of Email Monitor are transmitted to MSN/Hotmail from a Habeas email server, these messages will generate an SIDF authentication error unless the sender includes the Habeas email server in its SIDF record.  Habeas is, in effect, relaying messages on behalf of its customers, and therefore this error is legitimate and expected SIDF behavior.  Habeas Email Monitor customers may choose to ignore the error message because only messages sent through Content Rendering will generate this error.  If a valid SIDF record is published, then messages sent directly from a customer's email servers will not be effected.  Alternatively, the error can be eliminated by including the Habeas email servers in the SIDF record.