I wouldn't remember them either...
But I would create a cheat sheet with the few important details of what was in that e-mail. If it's that long, then a lot of it is likely obvious or fluff. The important parts I'll actually need should fit in list form on an index card.
In one campaign I played in, the party's psion would routinely take out an index card that listed everyone we knew & how we knew them, referring to the card as his character's memory.
I, personally, don't want to memorize things to play. I want to just play. There's a reason I've been leaning towards barbarians... Planning? Tactics? Nope... HULK SMASH! (or intimidate). I also do not like playing anything normal. I refuse to play humans entirely, and don't like dwarves, elves, etc... Even an orc or a minotaur are a bit too normal. Maybe an intelligent humanoid ooze creature or at least a naga or something... I'm still waiting to play my 4e character I made, Grizz, the Bugbear Barbearian. His backstory has plenty of people a DM could use if they wanted to, but they all fit on an index card I can keep with me (and most of their names mean "bear" in various languages).
Short version: Keep in mind who your players are. Some people want a heavy roleplaying memorize everything type of game. Some want a break from thinking.