I just started getting this error in my mail program any time I receive an email from anyone (not when I send an email). When I receive an email to my inbox in "Mail" I also get a second email with subject "Internet Mail Delivery", which also has an attachment titled "Mail Attachment." It says: The attachment has a bunch of gobbeldy gook I don't understand (header information I think). My ISP is Comcast. I don'[t[ know if this is an icloud issue, or a Comcast issue? Anyone have any experience with this type of thing? UPDATE: I also see this in the Internet Mail Delivery email: Reporting-MTA: dns;ms03531.mac.com (tcp_intranet-daemon) Maybe that's a clue?