I am a dinosaur and until very recently edited an honest to god *zine* -- you know, the old-fashioned things where fanfic gets put onto dead trees. And yes, that's edited, not just published. The things I learnt sitting on that side of the slushpile were extremely useful when it came to sending in my own submissions, both fanfic and profic. Editors who ask you to format your manuscript a particular way, or to send it to a specific address or... have reasons for wanting things done that way, usually good reasons. I am firmly in the camp that thinks that writers who bitch about stupid pernickety pointless submissions requirements should be sentenced to serve a minimum of one week as slush reader at whatever publication they're bitching about.