Alright well this is my first post please don't flame if it has already been posted.
The other day when I was scamming someone he brought a friend so this made it hard for me to mail the Gold from one character to another.
So what you need to bypass this problem is:
-Another Account
-Hearthstone to either SW, IF, or Shattrah City
-And a decent computer
The reason for having another account is for when the victim's friend is watching you all you do is get on the other account and hearth to the major city you are at. Then get to your scamming character and trade the gold you scammed from the victim to the other account and mail the gold to your main. After you mail the gold to your main log off the other account and disconnect your scamming character so you can delete him and remake him faster.
And the reason for having a decent computer is so when you dual-box both accounts you don't lag and the other person gets to booty bay before you can get the gold to your main.
Thank you and please don't flame and I hope this helps.