The following will be a 3 parter however they are kind of intertwined so I'll put them into a single topic.
[1] - Postman System
This would be in addition to the current message. The post man system would allow you to use a letter on a messager to instead deliver your hand written not to the player as a post man, rather then the messager who just relays a short message. If there is a way, this should be expanded to allow for offline messaging, to be delivered 60-120 seconds after a player logs in.
[2] Manageable Notice boards.
This would be a new class of notice board that can be administered by the creator. It would hold a limited number of messages at a time, and the original message creator, or the board admin can remove unwanted/unnecessary messages. This board wouldn't be able to hold more then 10 messages at a time.
[3] Player to player writ system
This is there the other 2 build into a player to player writ system. My 'vision' for this would be a special board that would be in pre determined locations (I think scripting this into portable boards would be a nightmare), where players can interact, and create writs for other players to complete. Players would be able to request an item/stack of something as a gathering quest, heads of certain monsters, amounts of enemies in an area, patrols etc. The creator would put offer an amount of gold as a reward upon completion, and the Postman system would deliver the item (if it was requested) to the creator on their next login/upon completion. This should be restricted to base resources or non complex items to keep the crafting player to player interactions intact.
This system could be enhanced later to make advanced writs such as:
High risk/reward vs bandit players, Town to town escort quests. These would be where the creator sends large amounts of a raw items between settlements and a set amount of gold is paid to the players, and the creator. The percentage of profits changing depending on how many players participated in the escort.
Bounties for player heads by name to be paid out by the creator to whom ever turns it in
Rob a house/NPC in a certain location
Kill an NPC in a certain location.
The above would be a more advanced take and add to crime vs law in a player on player manor.