easier way
export EMAIL=newsender@domain.com ; mutt -s "subject" destination@domain.com < /dev/null
My personal KnowledgeBase
I was getting this message when trying to install Fedora 16 as a Virtual Machine in VMWare, In the default installation I had an "autoinst.iso" as the primary optical drive and the actual ISO as a secondary Removing the primary (replacing it with the actual ISO) solved this issue