Jacui I'd say just delete any emails that you can immediately discount (I was ruthless, even text speak got deleted, I may have been looking for no strings fun, but I still didn't want to sleep with a chav).
Have a few email correspondences with anyone you have deemed sounds normal, then, if they still haven't emailed anything that makes you delete them, arrange to meet for a coffee.
There is no point in sending hundreds of emails/texts/messages back and forth. Send a few to sort the wheat from the chaff, then meet up for a further check-up. I'd say 99% of the face to face meet ups will result in an immediate crossing of them off the list. If you're looking for someone to sleep with you know almost instantly on laying eyes on them whether or not you want to see them naked or not.
Be ver very very careful. You can tell a lot about a man by their initial contact to you. If they're talking about sex and all the things they're gonna do to you, delete immediately. You don't need an arrogant bastard with no respect for a bit of subtlety.
Word your post very carefully, so it's clear you don't want a relationship but also clear that you have some taste.
If you have dealbreakers (who doesn't?) put them in the post. I wasn't interested in smokers so stated that.
Always remember that you have no obligation to reply to anyone, no obligation to give anyone more details or photos, no obligation to meet up with anyone, and certainly no obligation to sleep with anyone even after a few meetings, even after taking him back to your etc. etc.
Bascially, you don't have to be 'nice'.