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The Total Package
Find the Postmaster in Dalaran and lend him your aid.
The Total Package is a 5-point achievement earned by completing the full Postmaster quest chain in Dalaran, starting with a 
Lost Mail found on the ground near any Dalaran mailbox.
Find the Lost Mail
Search the ground near any mailbox in Dalaran for the Lost Mail item. It respawns approximately every 2 hours, and because it is BoE it can also be traded or found on the Auction House.
Deliver to Madam Goya
Pick up the Lost Mail to start the quest chain, then bring it to Madam Goya located in the Underbelly beneath Dalaran.
Report to the Dalaran Mailroom
After turning in to Madam Goya, you will receive a mail from the Postmaster summoning you to the Dalaran Mailroom, which is accessible near the pet cemetery. The room contains elementals, junk mail, and a Pepe overseer.
Sort the Flying Mail
Inside the Dalaran Mailroom, sort 9 pieces of flying mail to progress the quest chain.
Complete A Huge Package
Deliver 1362 
Solid Stone as part of the quest A Huge Package.
Return Invincible's Reins
In the Priority Delivery step, someone has neglected to loot 
Invincible's Reins and you must return it to them, which involves combat.
Tips
A copy of the
Lost Mail is mailed to you upon completing the quest chain, allowing you to hand it to a friend so they can begin the chain without waiting for the respawn.See the video guide for a full walkthrough of the complete Postmaster quest chain: https://youtu.be/riVh_F9U0CI