Quote Originally Posted by hunter2 View Post
Can I store more than 100 mails in my mailbox please? They obviously don't take up much storage space on the server.
Dedicated mail space (100) with a specific maximum amount of characters (usually represented by 1 Byte per character) and an item modifier most likely represented by an item referenced in HEX (takes minimal space for referencing), multiplied by the amount of player characters within the database = the dedicated storage allocation for player mailboxes.

Even if most of these mailboxes might be empty, they are dedicated to players, i.e. they need to be ready and available "just in case". For the same reason the currency tab will always contain data regardless if you have 0 or maximum of it, where item-based currency is just an inventory modifier.

Keyword is "dedicated storage space".