1. A method of processing a markup language electronic mail (e-mail), comprising: (i) identifying in a head section of markup language code any style rules for rendering the markup language based e-mail and sorting the style rules in order of reference in the markup language code; (ii) in dependence upon predetermined rules, interleaving the style rules for placement in a body section of one or more blocks of markup language code corresponding to one or more sections of the markup language e-mail; and (iii) storing the one or more blocks of markup language code including the interleaved style rules as separately downloadable blocks of data corresponding to sections of the markup language based e-mail.