Below is the text you can read from within the message.
You are needed to serve the kingdom of Kandarin. At last our magi have reopened the Well of Voyage. We must discuss your next commission.
His Majesty, King Lathas
After completion of the associated quests, if you have unlocked the entire Hub track, this item can be retrieved from the Quest Item Storage chest at the Quest Point Caravan if lost or destroyed.
There is no need to keep this item after the quests have been completed. As such, it can be destroyed or kept as you desire.