Post by SoCalWoWGal
Cash on Delivery or COD can be a great solution for you. Here is a description from
another forum post By Randoom on 2010/07/19 at 7:03 AM (Patch 3.3.5)
Cash on Delivery
Cash on Delivery or better known as COD is an option you can tick when you mail an item to a character, you can edit in the desired amount you wish for that item/s and in order to receive said item/s the player who received the mail must pay how much you asked for, the gold will be mailed back to you at no fee.
COD takes 1 hour like normal mail for the item/s to get to the player and 1 hour to get back with the gold.
If the person changes their mind or doesnt have the gold, the mail can sit in their mailbox for a maximum or 72 hours from the time you send it, it will be returned to you after that time with no loss (apart from the 30copper+ you used to send the mail)
If someone cannot get to your city due to level or hearthstone on cooldown this is a very easy way to still make that sale or buy that item, safe and easy.
I hope that helps!