I didn't realise that I had a problem until sending myself an email, and got a 'recipient didn't receive your email' message, so I popped over here to see if the icloud cleansing had affected the the .mac / .me variations of emails.
Edit;
although I now realise that the the icloud server sees @me.com and @mac.com as the same place and is refusing to send an email to itself.
nothing to see here *whistles*