Here's another question, why bother with writing a whole quest, when you can just add the item IDs to the list of "Starting Items", which already exists on L2Scripts sources?
I hope you catch my drift here.
There are many approaches that would lead to the same result, but the person asked about mail in particular, so how to do MAIL is what he got in response. Maybe he would like to use that Mail Reward System down the road for something else, such as MASS Rewards and stuff like that. You never know.